skull-fuck verb 2noun 1forms 5 verb2 •(slang, vulgar) To actively sexually penetrate someone's mouth; to have vigorous oral sex.I reached down and clasped the sides of his head. “I’m gonna skull-fuck you, faggot.” I began pumping myself into his mouth, ... — 2003 •(slang, vulgar) To sexually penetrate someone's eye socket.Gy. Sgt Hartman: You have three seconds, exactly three fucking seconds, to wipe that stupid grin off your face before I gouge out your eyeballs and skull-fuck you! — 1987 noun1 •(vulgar) an instance of skull-fucking formsskull fucked · skull-fucked · skull-fucking · skull fucks · skull-fucks