Pronounced (foo) An exclaimation of disgust when someone screws up or messes up. Also used to berate individuals with no P&D.

Its antonym is Jix.
How in the hell did he manage to screw that up. Fuuuu

you are such a fu.
by fred_berg December 12, 2009
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An acronym for "Force Units", a generic unit of measurement in chemistry.
by Resorath April 9, 2004
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Short for Fecal Urgency. Severe diarrhea that comes on so fast that a bathroom must be found within a matter of minutes because it's coming out no matter what. Often contains little or no solid matter and feels like you're peeing out your ass. Frequently occurs the day after a long night of drinking
Those Jager shots I did last night caught up with me around noon and I had to stop at a gas station for a major F.U. attack.
by Urban_Wordsmith February 26, 2005
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To say that something is "Full Uh Shit", Full of Shit. Someone that states falsehoods.
That dude is totaly FUS! George Bush is completely FUS.
by CrassMonkey June 10, 2008
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For people who are too lazy to type out the entire phrase, "Fuck You".

Often used in computer speak.

"fu imma kya!"


FU can be referred to as, "Intarwebs Engrish".
by RawrNinjaRawr March 13, 2009
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