look up any word, like the eiffel tower:
 
10.
A douchebag that sleeps with his ex girlfriends cousin and doesn't think anything of it. Ratfinks usually have no job, no car, and sleep on peoples couches for 4 months at a time. They also tend to have wide nostrals, a pointy nose, and a lack of chin. Beware; ratfinks love to cheat. Stay away from any ratfinks you know...they may be contagious.
Eric L: What, I never did that. (knowing he's lying)

Corina: Fuck you, you fucking ratfink!!!
by Bubbzy c: February 19, 2009
 
1.
Tattletale, stool pigeon, squealer, snitch, double-crosser, weasel.
That rat fink Lenny sold me out to Tommy G!
by Rodney Basil August 28, 2004
 
2.
A bastard modifier. A person exhibiting especially abhorrent levels of bastardry is known as a "ratfink bastard." Alternately, for a milder offense, the term "ratfink" can be used independently of bastard.
Do you know where Jared is? Next time you see him, tell that ratfink bastard I'm going to tear out his scrotum for knocking up my sister.

Timmy's the kind of lazy ratfink that leaves half a sheet of toilet paper on the roll just so he doesn't have to replace it with a new one.
by marahnna January 11, 2008
 
3.
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 06, 2005
 
4.
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 07, 2003
 
5.
1. just another way to call someone an jerk
2. a song by an AMAZING band.. the misfits. ROCK ON
dude joe is being a rat fink

F!! I SAID F.I.!!! F.I.N.!! F.I.N.K.!!! F.I.N.K. FINK FINK FINK FINK!!
by misfitfan April 17, 2005
 
6.
lying twoheaded, manipulitive, hypochondriac with crazy tendancies.
"dude chris is such a rat fink"
by appidodo October 03, 2008
 
7.
Rat fink is an experssion used to describe a person who has features that make him/ her look very rat like. These features could be hair that make them look stupid, or facial hair that is patchy, or just a very skinny face.
Man that new guy tony is such a RatFink!

yo did you just see that Ratfink , his beard is so stupid.

some bitch called me a Ratfink, so i smashed his window
by bob8999 March 07, 2007