prozzy noun a girl who is (allegedly) sexually available UK Derogatory; shortened from “prostitute”.
We didn’t use the word “slapper” in our school in the early Sixties. The most derogatory term you could apply to a girl was “prozzy", and that was reserved for an ugly lass from the back end of Burley. — Alan Titchmarsh, TrowellandError, p. 90, 2002