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).
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 nightcaught up with me around noon and I had to stop at a gas station for a major F.U. attack.