Green’s Dictionary of Slang

1. a fantasy copulation.

1964		I. Faust Steagle 226: He could lie down side by side and think. Oh, a mind fuck? That’s nowhere.
1992		R.C. Cruz Straight Outta Compton 23: ‘When I busted your mamma’s booty I didn’t have to ask.’ ‘That’s because she gave you a mind-fuck.’.

2. (orig. US) an emotionally overwhelming experience, usu. through drugs.

1971		L. Bangs in Psychotic Reactions (1988) 7: All that electro-distort stuff that rocked you guys to sleep when you were first tokin’ in your cradles was really unheard-of then, a real earthquake mindfuck.
1981		M. Baker Nam (1982) 17: When you weren’t going through that [i.e. physical intimidation] you [were] memorising your eleven general orders. It was a real mind fuck.
1993		R. Shell Iced 205: Hey the Army is the Army. It’s supposed to be a mind-fuck.
2001		S. King Dreamcatcher 329: Tell me again. Not all of it, just about the part you called the mind-fuck.
2010		A. Steinberg Running the Books 18: That’s a hell of a mind fuck [...] You’re sitting there locked in this small fuckin’ cell [...] and you’re thinklig: Christ, I built this.
2023		F. Bill Back to the Dirt 160: Whatever shit Kingsley gave him was casting a real mind fuck of a spell in his head.

3. (US campus) one who delights in manipulating others.

1960, 1975		Wentworth & Flexner DAS (Supplement).
1986		J. Ellroy Suicide Hill 30: ‘You're a rape-o! You're a mind fuck! You're on a wacko guilt trip, and I'm not kicking out any more of my money for your penance!’.
1989		P. Munro Sl. U.

4. a psychotic individual.

1977

J. Sayles Union Dues (1978) 312: ‘How many people you kill over there?’ ‘Didn’t count.’ ‘Didn’t count! Is that great? Comes back such a mindfuck he can’t remember. Fuckin space cowboy’.

5. deception, bafflement, confusion.

1977		J. Sayles Union Dues (1978) 188: You just a little Cathlict mindfuck [...] You’ll see how any kind of morals you got that’s holdin you back got no foundation, cause the people set up those morals, they is a lie.
1999		Indep. Rev. 12 July 5: No wonder this war [...] was summed up by a British officer as a ‘Bosnian mind-fuck’.
2002		D. Flusfeder Gift 203: It’s a mindfuck.
2023		J. Jackson Pineapple Street 217: ‘I mean it is a mindfuck, right? [...] he’s either a total jerk or a saint, and I just can’t figure out which it is’.