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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."
by Dave December 13, 2004
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Aug 5 Word of the Day
When your so pissed off from losing multiple amount of games that you play worse and worse till your so pissed you begin leaning over your keyboard screaming over every little mistake you make and complaining about gaming imbalances

(Common in Starcraft II)
"Why is johnny screaming at his computer"

"He lost a few games of Starcraft II, I think he is Tilting"
by Lashley1337 February 14, 2012
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2
A licentious girl who tends to spend copious amounts of time at a fraternity looking for ”frat guys” to pound her in ways that are illegal in most conservative states.
1. Kristen M. at Purdue University

2. Frat Meathead 1: Yo Brah, that Sarah has been shaking around here brah.
Frat Meathead 2: Yeah man, that girls a frat rat … brah.
by flouster April 23, 2009
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3
Some one who is known for sleeping with many guys in the same fraternity.
"Hey Frat Rat, can i be next?"
"what the hell are you talking about?"
"I've heard you've slept with every guy in this Frat."
by Annie-mouse November 10, 2012
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4
A female who goes after frat boys like a rat looking for food.
Frat guy: woah that chick sav. Loves all the frats! She's a total frat rat dude!
by Chicknfingrz May 14, 2016
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5
1. A greek system leech. Someone male (could be female) who is not an actual member of a particular Frat, but comes to every Fratty Function anyways. Most often these people wouldn't be accepted by the frat anyways and no one really wants them around.
FrattyFrat #1: So you think John's showing up tonight?
FrattyFrat #2: Dude, when doesn't that Frat Rat show up?
FrattyFrat #1: Shit... oh well, lets go rape some high school girls.
by Rob March 28, 2005
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6
a girl who spends so much time at a particular frat that she is practically a member. a girl of bro status who has been accepted by the brothers of a fraternity as one of their own.
don't mind her, she's just here broing out, being her standard frat rat self.
by #miamifratrat March 29, 2011
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