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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A trashy member of a college fraternity who has no boundaries nor regard for people, property, morals, or rules
Get out of my dorm you filthy Frat-Rat!!
by OldDogg March 2, 2019
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A girl who goes around to every frat house not only sucking but swallowing the semen from every male in site. This girl doesn’t even need her kitty played with to have fun as she enjoys viciously sucking the soul out of every person with a penile.
“Hey John did you see that girl kaitlyn sucked off 66 guys this semester?”
John: “Yeah man isn’t she a frat rat?”
by Penis shucker October 11, 2023
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Just your typical cock sucker frat bro. Buddy loves his blow and his white claws. He spends his week days smoking the worst skunk weed you’ll ever find and the weekend fucking 3’s and telling his friends he’s “that guy”
Freddy the frat rat’s throwing a banger at the house this weekend, should be epic.
by Joey applesauce October 9, 2023
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