Blow-up Doll

Definition:

Blow-up Doll is a filthy whore - usually your local bar fly. She likes sex as much as the next guy, but presents herself in a much more conservative fashion. It might cost you a drink or two, but probably won't.

Exemplification of usage:

Me: Can you believe she’s hooking up with that guy? How many guys is it now?

Her: She’s the town blow-up doll. Her vagina needs to go through a car wash.