Started from 4chan during the Black Lives Matter (BLM) protest, the copypasta calls for the extermination of black people. It became a popular meme due to its unhinge nature and has evolved into many different variations.

Kill niggers. Behead niggers. Roundhouse kick a nigger into the concrete. Slam dunk a nigger baby into the trashcan. Crucify filthy blacks. Defecate in a niggers food. Launch niggers into the sun. Stir fry niggers in a wok. Toss niggers into active volcanoes. Urinate into a niggers gas tank. Judo throw niggers into a wood chipper. Twist niggers heads off. Report niggers to the IRS. Karate chop niggers in half. Curb stomp pregnant black niggers. Trap niggers in quicksand. Crush niggers in the trash compactor. Liquefy niggers in a vat of acid. Eat niggers. Dissect niggers. Exterminate niggers in the gas chamber. Stomp nigger skulls with steel toed boots. Cremate niggers in the oven. Lobotomize niggers. Mandatory abortions for niggers. Grind nigger fetuses in the garbage disposal. Drown niggers in fried chicken grease. Vaporize niggers with a ray gun. Kick old niggers down the stairs. Feed niggers to alligators. Slice niggers with a katana. 

Longer version

Kill niggers. Behead niggers. Roundhouse kick a nigger into the concrete. Slam dunk a nigger baby into the trashcan. Crucify filthy blacks. Defecate in a niggers food. Launch niggers into the sun. Stir fry niggers in a wok. Toss niggers into active volcanoes. Urinate into a niggers gas tank. Judo throw niggers into a wood chipper. Twist niggers heads off. Report niggers to the IRS. Karate chop niggers in half. Curb stomp pregnant black niggers. Trap niggers in quicksand. Crush niggers in the trash compactor. Liquefy niggers in a vat of acid. Eat niggers. Dissect niggers. Exterminate niggers in the gas chamber. Stomp nigger skulls with steel toed boots. Cremate niggers in the oven. Lobotomize niggers. Mandatory abortions for niggers. Grind nigger fetuses in the garbage disposal. Drown niggers in fried chicken grease. Vaporize niggers with a ray gun. Kick old niggers down the stairs. Feed niggers to alligators. Slice niggers with a katana. Put a bomb in a nigger's mouth. Throw knives at niggers. Inflate niggers until they pop. Send niggers into a blackhole. Castrate niggers. Feed niggers poisoned food. Force niggers to walk the plank. Push niggers into a pit. Kneel on a nigger's neck. Curse niggers with a spell. Stuff nigger babies into the washing machine and turn it on. Flatten niggers with a tank. Pop a nigger's car tire. Strike nigger children with a ruler. Make niggers swim in the Mariana Trench. Cut off a nigger's limbs. Airdrop niggers into Antarctica. Throw niggers off the boat. Pressurize niggers into fine crystals. Light fireworks in a nigger's ass. Falcon-punch a nigger in the face. Make niggers into fiction. Blow niggers heads off with grenade launchers. Blow niggers brains open with a sniper rifle. Lock niggers in a cage and drown them underwater. Nail niggers to a cross and stab them. Run over niggers with a tank feet-first. Crush niggers with a press. Attack niggers with acid. Boil niggers in a pan. Lock niggers inside a brazen bull. Burn niggers alive. Drag niggers across a wall of spikes. Pour molten lava on niggers. Quarter niggers. Impale niggers on a pike. Tenderize niggers with a mallet. Ionise niggers in a mass spectrometer. Irradiate niggers in a nuclear reactor. Spaghettify niggers in a black hole. Curse niggers with the necronomicon. Trap niggers in purgatory. Bang a niggers testicles with a spiked bat. Throw niggers off a twelve story building. Freeze dry niggers in the vacuum of space. Fry niggers with power lines. Feed niggers ricin. Kneecap a nigger with a twelve gauge. Re enslave niggers. Sell niggers organs on the black market. Run niggers over with an eighteen wheeler. Throw niggers into the grand canyon. Burn niggers with jet engine exhaust. Beat niggers to death with a tire iron. Cauterise a niggers asshole with a blowtorch. Sacrifice niggers to the sun god. Drop niggers out of a plane at fourty thousand feet. Feed niggers to sharks. Load a nigger into a cannon and shoot the nigger at a concrete wall. Keel Haul niggers under a galleon. Disembowel niggers with a bayonet. Strap a nigger to a cruise missile and launch it at a nigger neighbourhood. Drop niggers into chernobyl reactor building number 4. Hang, draw, and quarter niggers. Lure niggers in with fried chicken and trap them with bear traps. Force a nigger to learn calculus, then kill the nigger anyway. Atomize niggers with a powerfist. Throw niggers into vats full of FEV virus. Choke niggers with barbed wire. Throw pianos at niggers from 40-story buildings. Throw niggers at pianos from 40-story buildings. Deep-freeze niggers in liquid nitrogen then shatter them with a hammer. Tie niggers to ICBMs then fire them at Israel. Shoot niggers with syringe guns. Defecate on nigger food stamps. Make niggers pay child support in blood. Build a newton cannon and fire niggers into the orbit. Put advertisement posters on niggers then nail them to their bodies with a hammer. Irradiate niggers with depleted uranium. Launch a nigger with a trebuchet. Send a nigger exploring titanic in a cheap submarine. Use a nigger as a crash test dummy. Tie niggers onto growing bamboo shoots. Film an entire jackass movie on a nigger. Trample niggers. Bury niggers alive. Play bowling with niggers heads as pins. Grate niggers with a cheese grater. Get niggers stuck in an elevator. Spray a niggers toilet paper with poison ivy. Shoot a nigger directly with the Gustav gun. Sabotage a niggers parachute. Sabotage a niggers bungee. Trap a nigger under ice. Force a nigger to work and support a family of 5. Force niggers into gladiatorial combat. Send niggers back to warring African tribes. Hide a snake in a niggers room. Put niggers on a hot air balloon with low gas. Harvest a niggers organs. Waterboard niggers with gasoline, then set them on fire. Flay niggers. Tie niggers to train tracks. Put laxatives in their koolaid. Recreate mortal kombat fatalities on niggers. Gibbet niggers. Tie a lightning rod to a niggers head during a storm. Lure niggers into suicide pods. Bury niggers neck deep and surround them with scorpions. Clear a mine field by sending niggers to it. Stir niggers into cement. Squeeze niggers through a chain link fence. Hack niggers socials and make them say they have irrefutable evidence that would lead to Hillary's arrest. Perform adorcism on a nigger. Microwave a niggers head. Suck a nigger into pool drainage ass first. Pour nitroglycerin inside a niggers basketball. Inject ebola in its food. Put a chubby nigger in a tribe of cannibals. Pressure wash niggers black skin. Play games with niggers jigsaw style. Trim a niggers nose hairs with a lawn mower. Strap a nigger to a wind turbine blade. Flatten a nigger in an industrial rolling machine. Turn a niggers bones into furniture. Make minced meat out of a nigger and serve nigga patties to other niggers. Feed a nigger viagra and put an activated sawblade in front of its dick. Disguise a thermally activated lightsaber as a niggers dildo. Stone niggers. Tranquilize niggers and put them in lion pits. Make a subhuman centipede from niggers. Throw a nigger down a well. Prescribe incorrect medication to niggers. Pimp-slap niggers into airplane turbines. Displace niggers in a predicted meteoroid contact area. Gift a nigger a lethal dose of fentanyl. Put dog collars on niggers at maximum voltage. Give niggers sentient brain parasites. Give niggers over to aliens in area 51 to be probed. Leave niggers out for vultures. Drive a nigger into a tornado with a remote controlled vehicle. Do freaky voodoo on a nigger. Strap niggers on a roller-coaster and use them as target practice. Strap niggers to a judas cradle. Blast niggers with Civil War cannons. Crucify filthy niggers. Whip niggers into obedience. Slingshot a nigger into orbit. Rocket niggers into the sun. Stir-fry niggers in a wok. Bite a nigger and drink their blood. Urinate into a nigger's gas tank. Judo throw niggers into the wood chipper. Unscrew a nigger's head off. Bake niggers into nigger-pizza. Arrest niggers for no reason. Electrocute niggers. Curb stomp pregnant niggers. Beat a nigger up. Slice a nigger up and wear their skin. Set niggers on fire. Spin niggers around until they puke. Tie niggers to a train track. Karate kick a nigger in the testicles. Stomp nigger skulls with steel-toed boots. Broil niggers into a broth. Deep fry niggers. Fourth-trimester abortions for niggers. Blend niggers in a blender. Snap a nigger's neck. Throw niggers off buildings. Send aliens to abduct niggers. Force niggers to ride the euthanasia coaster. Crush niggers with anvils. Throw niggers off of rooftops. Incinerate niggers. Starve niggers. Blow niggers up with dynamite. Gulp niggers. Feast on nigger eyeballs. Cave in a nigger's skull. Kiss a nigger to death. Peel a nigger like a banana. Wipe out nigger tribes. Deny niggers into Heaven. Freeze niggers in the vaccum of space. Hard boil a nigger. Lock on to niggers with a harpoon. Cryodesiccate a nigger. Ferment niggers into stew. Ensnare niggers. Nark on niggers to the army. Cause a total nigger purge. Jam a nigger into a geyser. Axe murder a nigger. Unleash Smelvin upon niggers. Put niggers on ships going to Africa and blow up the ships after they set sail. Total nigger death.