buff, v.² — Green’s Dictionary of Slang

buff v.²

1. (US gay) to have anal intercourse.

1972

B. Rodgers Queens’ Vernacular 87: anal intercourse [...] buff (fr teen & hustler sl, mid ’50s // buff = polish a surface).

2. to perform oral sex.

1992		T. Williams Crackhouse 120: A master blaster is nothing more than a big rock of crack. But a double master blaster is something altogether different. That’s when a man is being buffed by a girl while he’s smoking on the pipe with crack in it and he comes.
1993		Eble Campus Sl. Oct.

buff the button (v.)

of a woman, to masturbate.

2024

J. Meades Empty Wigs (t/s) 71: I also feared the possibility of Marie-Yvonne buffing up her button.