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noun Slang.
  1. fink(defs 3, 4).
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Origin of ratfink

First recorded in 1960–65; rat + fink
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for rat fink

betrayer, blabbermouth, decoy, fink, informant, informer, plant, rat, sneak, snitch, source, spy, squealer, tattletale, turncoat, weasel, double-crosser, stoolie, tattler, canary

British Dictionary definitions for rat fink


  1. slang, mainly US and Canadian a contemptible or undesirable person
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Word Origin for ratfink

C20: from rat + fink
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for rat fink


also ratfink, 1963, teen slang, see rat (n.) + fink (n.). Popularized by, and perhaps coined by, U.S. custom car builder Ed "Big Daddy" Roth (1932-2001), who made a hot-rod comic character of it, supposedly to lampoon Mickey Mouse.

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Online Etymology Dictionary, © 2010 Douglas Harper