Any girl, usually between the ages of twelve and twenty that acts easy, dumb, and is used for her body. The word derives its meaning from the two words 1. push "to push around and bully", and 2. pop "to pop her cherry". Also with the combined noun and double meaning "push pop" or sweet thing, a push pop is a sweet girl who hangs out with douche bag boys and lets them do what they want.
Too bad that girl's such a push pop, she could do so much better than him. Why do good girls always go for such douche bag guys?