A young girl (around ages 12-13) who is dressing and behaving in such a way that is reminiscent of a prostitute...or her favorite celebutant (e.g. Paris Hilton).
A re-pubescent female who is scantily clad, hanging out in a public area (e.g. the Mall or movie theater) and behaving like a "stupid spoiled whore."
I hate going to the Neshaminy Mall movie theater! It's always way too crowded and always crawling with prostetots! Last time I went some prostetot totally yelled at my boyfriend...she was like 13!