Rock gash is a slut who’s dated and been fucked by band guys. They are usually not interested in "non band guys" till that scene has run its course, or their looks have.
The long standing rule is; you fuck rock gash, but you don’t date it.
Kellie used to get fucked by an idiot from that loser metal band. Too bad, she would have been datable, but now she’s just rock gash.