Green’s Dictionary of Slang

face-fuck v.

to be the active partner in an act of fellatio.

1970		Up & Coming 31: He fucked that face just as hard as he could.
1977		‘John Dick’ Blue-blood Stud 106: [H]e positioned the young Adonis just right, so that he could face-fuck John to the fullest [Simes:DLSS].
1983		B. McDonald Cum 103: He’d slap my face with his hard on, force it into my mouth and face-fuck me until ready to come [Simes:DLSS].
1990		S. Morgan Homeboy 277: Billy [...] slammed her up against the cage’s wire mesh, which he clutched to facefuck her for all he was worth.
2002		an1662 ‘First Time’ on Nifty Erotic Stories Archive 🌐 I nearly dropped to my knees, the person on the bed getting face fucked was my butch big jock brother.
2005		E. White My Lives 234: One day T burst into the filthy, shit-streaked [...] toilet and started fucking Teach’s face.
2008		‘Alex’ Great Cock Hunt 121: [T]hat cock that had so masterfully fucked my face swing between his thighs [Simes:DLSS].

In derivatives

face-fucker (n.)

to fellate.

1984		R.N. Boyd Sex behind Bars 56: Gary was a real face-fucker [...] The only way to handle his bucking bronco approach to sex was to position my head and hold it firmly in place while he pounded away [Simes:DLSS].
1996		Beckford & Dax D.O.C. Lust Letters 14 Mar. 18: One of my favorite face-fuckers shows up at about eight and we find a nice spot where he can stand on a rock and I can blow him [Simes:DLSS].