Dirty-butt

Originally used being facetious meaning a guy/girl that is carelessly slutty; a person likely to bang someones significant other, knowing they're in a relationship already, showing no sympathy or remorse for who or what it effects; a person likely to have slept with everybody in the area or clik, usually found to be untrustworthy and sneaky

Did you see lusia earlier? She's such a dirty-butt! You can't believe a word that cums out her mouth! Is there anyone around she hasn't screwed already?