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ratfink

[rat-fingk]
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noun Slang.
  1. fink(defs 3, 4).

Origin of ratfink

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

ratfink

noun
  1. slang, mainly US and Canadian a contemptible or undesirable person

Word Origin

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

n.

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.

Online Etymology Dictionary, © 2010 Douglas Harper