1) Middle school girls who think they're much older than they are.
2) Middle school girls who will go out with any guy who asks just because they want a boyfriend
3) Middle school girls who would make out with any cute guy in the school.
4) Middle school sluts.
Or all of the above.
"Ohmygawsh, Becky, Claire is like, SUCH a claremont girl!"
"Ugh, I think my best friend is becoming a claremont girl."
"Hey, man, need a date? Just pick one of the claremont girls."