Green’s Dictionary of Slang

(US) one who has anal sex; the implication is usu. a male homosexual.

1970		‘L.C. Cole’ Hump Haven 156: There was a groan of pain from the boy, but the ass-fucker took no notice [Simes:DLSS].
1979		Maledicta III:2 231: Ass-fucker is vivid but, as we said, won’t do, but ass-bandit has a limited circulation.
1984		‘John Coriolan’ Smile of Eros 174: [H]is rounded butt would drive an ass-fucker like Hawk to rape [Simes:DLSS].
1996		Capital Q Weekly (Sydney) 29 Mar. 33/1: Seeks one or more horny, well hung arse fuckers.
2001		J. Stahl Plainclothes Naked (2002) 149: Get it, ass-fucker. I’m busy here.