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When simply calling somebody a "cock head" or "knob jockey" will not do. You bring out "Cock rat".
originaly from the tv show "Chips" where EVERYBODY on that show were "cock rats",
"Your a fag"
"shutup. You fucken cock rat"
=O
"yeah thats right. pwnd."
by Josh Pazza February 08, 2007
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A girl who is a complete slapper. ie, a slut
Derived from mallrat
I got with Jenny last night. She is such a cockrat, she will fuck anyone.

Wendy is such a cockrat man, I wouldn't even fuck her with your dick.
by Mattlock™ April 27, 2008
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A guy that you would call a “selfish asshole,” “douchebag,” “dick.” Someone that fucks around with anyone and anything that it can get. Otherwise known as a “fuckboy.”
Girl 1: “Hey, are you still seeing that guy?”
Girl 2: “Hell no, that guy fucks anything he can get. He’s such a cock-rat.”
by TacosRLife October 18, 2017
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a species produced when a penis and a mouse or rat mate and have a son. this son looks much like a cross between a cock and a rat, therefor, it is a cockrat.
"Crikey! Today, we're huntin' the New Jersean Cockrat today on the Croc Hunter! OI!"
by kzos June 17, 2003
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