Fetus headbutt Share definition Flag When your friend is pregnant and needs to have an abortion, you headbutt her fetus area hoping to kill the fetus. "Ah, I think I'm pregnant I need you to fetus headbutt my fetus!" Fetus headbutt by marmar37 January 1, 2009 0 0 Get merch Get the Fetus headbutt mug. Buy Now — $32.95 See more merch