The girl you ask your girlfriend to bring to parties so she can entertain your friends while you do your girlfriend in the back. She generally gets drunk very fast, 4-5 beers, and gets with every boy at the party. Usually, she will be locked in a different room with a different guy every twenty minutes. Commonly, high school football players adore this girl, especially while they are drunk, but find it extremely awkward to make conversation with, or even look at, this girl after. A common synonym for party whore is calling her the "Gina" or the "Gyna".
Hey dude, ask your girlfriend to bring her friend Gina, that party whore, down to your shore house so we can all get some.