Top Definition
A girl who gets laid on by so many frat boys that she becomes one of their mattresses. Short for frat mattress.
Guy 1: I hear that girl's a total frat mat.
Guy 2: Maybe I should go take a swing at her...
Guy 1: Not unless you want hepatitis!
by UMW_Paul March 23, 2008
1 more definition
Girl who will sleep with any guy wearing greek letters. She has had so much frat boy on top of her she becomes a mattress...literally. Short for frat-mattress
Oh shit Scott, that biatch in that corner is a hardcore frat-mat. I bet doin the grown-up with her is like fucking an old catchers mitt.
by Donnie Vomit January 03, 2006

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