Green’s Dictionary of Slang

1. the buttocks, the anus.

1945		S.J. Baker Pop. Dict. Aus. Lang. 156: (‘WWII troops’) chuff, the backside or anus.
1955		D. Niland Shiralee 101: And you can shove that up your chuff and take another swipe.
1959		C. Lee diary 30 Apr. in Eight Bells & Top Masts (2001) 206: Chippie’s ta-fong [i.e. typhoon] was really blowing like stink right up our chuff .
1968		G. Slatter Pagan Game (1969) 164: Sitting on his chuff waiting for work to turn up.
1981		Observer (London) 20 Dec. Suppl. 31: ‘And that’s the fellow you get driving up your “chuff”’ [Simes:DLSS].
1988		McGill Dict. of Kiwi Sl. 28/1: chuff buttocks; from Durham dialect word used in England to mean a lumbar thrust to stimulate male member during coition, in America to mean pubic hair.
1993		(con. 1945) S. McAughtry Touch and Go 183: I got vitamin injections up the chuff and psychiatric counselling.
2006		P. Shannon Davey Darling 103: Your bloody father doesn’t look like he’s going to get off his chuff and do anything.

2. (US, also chuffer) a young, passive homosexual [ext. of sense 1].

1890-1904		Farmer & Henley Sl. & Its Analogues IV 7/1: indorser, subs. (venery).—A sodomite; a chuffer.
1949		Partridge DSUE (3 edn) 1014/2: chuff, n. 3. Hence, chuff chums, male homosexual associates, a chuff being a catamite.
1966		Trimble 5000 Adult Sex Words and Phrases 43: chuff (Vulg.) [...] 2. A Catamite; young homosexual who takes the Passive role in Pederasty.
1972		B. Rodgers Queens’ Vernacular 146: passive partner [...] chuff [er].

3. (mainly Aus./northern UK, also chuff-box) the vagina [ext. of sense 1].

1984		Partridge DSUE (8 edn) 1014/2: chuff-box, the pudendum muliebre.
1998		I. Welsh Filth 4: My bowels are as greasy as a hoor’s chuff at the end of a shift down the sauna.
2012		(con. 1980s) I. Welsh Skagboys 452: My scarcely more edible egg flan, dry as an auld nun’s chuff.
2015		I. Welsh Decent Ride 169: Kin tell you’ve no hud any bairns. That chuff ay yours is as tight as a drum.
2019		Twitter 23 Apr. 🌐 I’m devastated that anyone would actually need a thread explaining why you shouldn’t stuff your chuff with garlic, but here’s a very good on.

4. (gay) pubic hair [ext. of sense 1].

1982

Maledicta VI:1+2 (Summer/Winter) 131: Pubes […] chuff, Fort Bushy, fur, garden, grass, lawn, mowed lawn if shaved.