Frat Mattress 

Someone who gets around, and often sleeps with members of a fraternity.

Person #1: Let's do some word association. Frat Mattress.
Person #2: Whitney
Person #1: Why?
Person #2: Because it just seems to fit.

or

Whitney is such a frat mattress.

Frat Mattress by rusty bellige March 31, 2009

frat mattress 

1. Adjective. Loose person.
2. Female who sleeps with lots of men, usually members of a fraternity.

Laura is a big frat mattress.

frat mattress by Matt December 7, 2004

frat matress 

A college girl, or townie who spends most of her time under 1 or more frat boys.

My roomate is such a frat matress, if i put her under a blacklight the girl would glow.

frat matress by Lylli December 14, 2006