Green’s Dictionary of Slang

1. (US campus) a very attractive young woman.

1970		Current Sl. IV:2.
1998		K. Anderson Night Dogs 215: ‘I’d trade my dog for that little snapper there in that peace-and-love T-shirt. With the big tits’.

2. (US) the vagina; also attrib.

1971		E.E. Landy Underground Dict. (1972).
1990		S. Morgan Homeboy 171: She wrung expert snapper muscles slamming it shut like elevator doors.
1992		Bentley & Corbett Prison Sl. 62: Snapper The vagina.

3. (US black) excellent sex.

1994

G. Smitherman Black Talk.