Tattletale, stool pigeon, squealer, snitch, double-crosser, weasel.
That rat fink Lenny sold me out to Tommy G!
by Rodney Basil August 28, 2004
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That Rat Fink leaked our info to the public again!
by Kenzo_Representative December 7, 2021
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A goofy looking rat character designed by Ed "Big Daddy" Roth.

A show car designed by Ed "Big Daddy" Roth.
Big Daddy's Rat Fink car of 1963 was a kart driven by a Cadillac starter motor.
by Cap'n Bullmoose May 7, 2005
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lying twoheaded, manipulitive, hypochondriac with crazy tendancies.
by appidodo October 4, 2008
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An insult used by Fawful from Mario & Luigi: SuperStar Saga. See Fawful
Lets see how well you deal with this Rat Fink!
by Yert April 5, 2006
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1. the combination of two terms used to describe the underhandedness of some one to stress what a low down sneak they are.
Matt is a rat fink, he told the teacher I snuck another cupcake.
by Bud E Love May 7, 2003
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Very derogatory descriptive slang from the 60's. You thought Mother Fucker was bad, Rat-Fink was the 60's word for mother fucker.
by You're such a mother fucker November 13, 2015
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