When something really really bad is done to you or a friend or when you do something really stupid. Can also be in reference to a person who has screwed you over.
Man I can't believe your girlfriend left you after 5 years for another girl. You got rats fucked

Dude you didn't pay rent for the last 6 months and we are getting evicted. You are a rats fuck!
by Billy Gia June 11, 2008
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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!
by Adam82 November 6, 2006
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One package kool-aid cherry mix, 2 fifths rum, 1 fifth gin, 1 fifth vodka, 1 cup sugar, and some water.
Lets drink a bucket of rat fuck.
by Tom Larson II October 10, 2007
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The aftermath of someone from Kentucky dropping test equipment off of a tall building.
They completely Rat Fucked that CT tester
by ThatDSEguy November 6, 2019
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The King of snitches! A Obtuse individual in a leadership position. Making up standards as he goes along and never adhering to the moraly right. A piss poor leader of the lowest form. Out for himself and his convoluted ideals.
That rat fuck Guillermo thinks he is the best leader since Audie Murphy
by The Prospect April 30, 2008
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A newcomer to a group/organization who has not yet earned the right to be fully integrated into the group with equal advantages as senior/veteran members.
“Hey, can Bill go to the party tonight?”

“You mean Bill the Virgin Rat Fuck? I don’t think so, he’d be better off hanging out with the other Virgin Rat Fucks”
by Room001 September 16, 2019
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