A girl that spends exorbiant amounts of time at a frat house, usually with the intent to slut it up with one or more of the fraternity brothers.
A girl that fucks a different frat guy every week.
1. Michelle S. at Illinois State University
2. Frat guy 1: "Man that chick is over here doing a different brother every week!"
Frat guy 2: "Yeah dude. She's a frat rat."
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