Clutty

A girl who looks classy but acts slutty at the same time.
Someone who has elegance and class but is a slut all the same.

Jake: "Oh Man! Why would you be such a cock blocker dude! I hear she's real classy"
Thomas: "Hell no dude! She's clutty once you get to know her"

Derek: "Dude! So I hear Michelle is officially a sorority sister"
Nate:"f'course man.. she's a clut!"