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Originally the term was used in surfer culture for tricks on the waves causing a surfer to fall. The term was coyly taken by Ed "Big Daddy" Roth for his cartoon character Rat Fink, who had the letters "R.F." on his chest. Those in the know would realize that the name really meant this term.

It was resurrected by the "USC Mafia" in school elections before they joined the Nixon administration and perfected the practice; it means to utilize dirty tactics (i.e. stealing ballots, changing the time of events with organizers, etc.) in political campaigns to win at any cost. This practice eventually led to the Watergate scandal and Nixon's resignation.

Carl Rove is a true rat-fucker.
One staffer really rat-fucked a guy, he wrote a false and racist memo allegedly from a Democratic candidate in Florida. He fuckin' lost!
rat-fuck by Adam82 November 6, 2006
The act or acts of completely ruining someones day, life, or overall belief of wellbeing.
Refer to "Cleveland Torpedo";
I am gonna rat-fuck your house when we party; I rat-fucked this girl the other night and left her stranded out in the middle of nowhere with my cum still in her hair; Driving by an Iraqi checkpoint at night I decided to rat-fuck them with my spotlight, thus night blinding them and illuminating them for the snipers
Rat-fuck by Slayer 6 November 2, 2008

rat fuck 

-verb
1. Slang. To rifle through something taking the one special part out of it leaving the dregs behind.

-origin
1940's era US Military, most likely the Army.

Related Forms
rat fucker, noun
1.We caught that fat profile bitch that stayed back in the tents rat fucking all the MRE's for the fatty cakes and candies!

2. Damn! My dad rat fucked all the cashews out of the mixed nuts again!
rat fuck by dbldragons August 28, 2010

Rat Fuck 

To screw someone over or to take advantage of them. The lowest act known to man.
Not only did he steal my wallet, but he used my credit cards. He is a real rat fuck or he really rat fucked me.
Rat Fuck by sfguy September 4, 2005

Rat Fuck 

To go through something looking for one thing only to leave the rest for the next poor bastard.
Brown rat fucked the the assorted cookies taking the chocolate chip ones and leaving the oatmeal
Rat Fuck by bigious alious March 15, 2009

Rat Fuck 

Latin: Rodendum Copuli--the least amount of concern you can express for any given act.
I don't give a rat fuck what she said,I did not fuck her sister!
Rat Fuck by vernon dutton January 20, 2004