Green’s Dictionary of Slang

1. (US black) the anus.

1983		R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].
2002		‘Touré’ Portable Promised Land (ms.) 156: We Words (My Favorite Things) [...] Stank. Gank. Skank. Stomp.

2. (US black, also stank-stank) the vagina.

1980		E. Folb Runnin’ Down Some Lines 151: The fact that a woman’s vaginal scent is often perceived negatively is reinforced by terms like stank.
2000		P. Beatty Tuff 242: I probably drank more alcohol than that this morning when I was eating your stank-stank.
2000		Ebonics Primer at www.dolemite.com 🌐 hang down Definition: penis Example: I am go by where my old lady stay to get some stank on my hang down.

3. (US black) the smell of sex.

1999

‘Master Pimp’ Pimp’s Rap 31: I got up and went to the restroom and washed the stank off me.

4. (US campus) any form of unpleasant smell.

1999		Eble Campus Sl. Nov.
2005		Guardian G2 28 Apr. 16: Dirtee Stank is American slang for smelly and horrible.
2008		Simon & Burns ‘Stay Frosty’ Generation Kill ep. 6 [TV script] You imagine the stank on that cunt?