1. vulgar slang Someone with whom to have sexual intercourse or engage in sexual activity; a potential sexual partner. (Potentially pejorative or objectionable; usually said of a woman.) There's a fine-looking hunk of ass down at the end of the bar. I'm going to go over and talk to her, see if I can't make something happen.
2. vulgar slang By extension, sexual intercourse or activity in general. (Potentially pejorative or objectionable; usually said of a woman.) God, I haven't had a hunk of ass in weeks! I must be off my game or something.