Green’s Dictionary of Slang

1. to simulate intercourse, usu. by rubbing one’s clothed body against that of one’s partner.

c.1937		in Atkinson Dirty Comics 106: Try to dry-fuck the hostess who is the big shot’s sweetie [HDAS].
1971		R.D. Pharr S.R.O. (1998) 110: ‘That little bit of dry-fucking isn’t what’s making me go [to the store]. I’m just a damn nice gut to women’.
1991		D. Jenkins You Gotta Play Hurt 43: Her [i.e. a stripper] main prop on stage was a Honda motorcycle. The engine mysteriously cranked up on its own each time Heike went down on the gas cap or dry-fucked the rear fender.
2012		J. Duke ‘Bastards of Apathy’ in ThugLit Sept./Oct. [ebook] He did a little bump and grind dance, dry fucking the air.

2. to have lesbian sex, rubbing the vaginas together; thus dry-fucking n.

1965		Ward & Kassebaum Women’s Prison 99: There is what we call giving some head [...] Or what they call dry-fucking.
1972		B. Rodgers Queens’ Vernacular 59: to practice tribadism [...] dry fuck.

3. to have (anal) intercourse without any form of lubrication.

2001

J. Stahl Plainclothes Naked (2002) 241: I don’t want to dry-fuck your bitch up the ass and make her call me Daddy.