Its a very old cursed 4chan copypasta from ~2007 that got copy pasted around forums before social media was a thing.
If i was a girl, i would get pregnant as many times as possible, then have abortions after the third month of being pregnant so i would deliver a potato sized 1/3 developed dead fetus, then i would take the fetus, put it in a jar of preservative liquid and put it on a shelf in a secret room in my house, and i would do it until i? had so many that the rooms walls were nothing but potato sized aborted fetuses, then i would have a kid and when they're bad i would make them sit in the fetus room.