Very derogatory descriptive slang from the 60's. You thought Mother Fucker was bad, Rat-Fink was the 60's word for mother fucker.
Rat-Fink derogatory mother fucker
by You're such a mother fucker January 18, 2016
Get the Rat-Finkmug. by appidodo January 16, 2009
Get the Rat Finkmug. by Yert April 23, 2006
Get the Rat Finkmug. by jaggedlittlethill April 13, 2020
Get the stool pigeon rat fink motherfuckermug.