butt-fucker Share definition Flag A butt-fucker is a guy who likes to fuck another guy in his asshole until he has a butt-gasm. Christian is a real butt-fucker with his big dick! butt-fucker by USAF Cadet September 22, 2020 0 0 Get merch Get the butt-fucker mug. Buy Now — $32.95 See more merch