An acronym for "Force Units", a generic unit of measurement in chemistry.
by Resorath April 08, 2004
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1. The equivalent of the word fuck when you're attempting to keep your mouth clean around parents, young children, etc.

2. The fu in kung fu. 'Cause we're fucking cool like that.

3. The equivalent of the word fun, when you're still attempting to have a literate conversation while suffering from hapyp (good luck with that, kids. Trust me, I've tried).
1. Oh, hello mom. -stubs toe- AHHHH FUUUUUUUuuuuuu....

2. Oh yah, man. We're gonna do some Kung Fu 'cause we're so cool.

3. Yeah, we're gonna have some fu today.
by Sonny Pestilence August 22, 2006
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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 09, 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 12, 2009
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