1 definition by RT4T

An informal way to say "goodbye and good luck with whatever you're trying to accomplish" when you're so flabbergasted by an individual's or group's words or actions that you only have 4 letters in you. Not at all related to profanity or the work "fuck"
Person: Donald Trump would make a great president.
Logical human: fuk u
by RT4T November 2, 2015
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