This word is pronounced deep from the bowels of ur stomach, it should sound like a old man shivering out in the cold. It has many meanings such as howling laughter and relentless chaos. It also describes the bizarre, the criminally insane, and the downright schizophrenic. UHUHUH is simply a madman's word and shouldn't be used lightly in day-to-day conversation.
When u find out u dont have any milk for ur cinnamon toastcrunch you yell out, "UHUHUHUHUHUUHUH."
When you get an epic kill in a game (usually Splinter Cell: Chaos Theory Versus) such as a grenade bouncing off a wall and blowing up in a spy's face, zooming in and right away getting a headshot, or grabbing a mercenary in a completely stealthy way, which makes you yell "UHUHU!!!" due to the awesomeness that just happened.
(people on voice chat in SCCT Versus)
Merc 1: Oh larnit he's getting away!
Merc 2: I'll kill that schweinhund! *chucks nade far away, it bounces off the wall and lands right in front of the spy* UHUHU!!!!!!!!!!
AgentX_003(the spy): NOOOO I got owned!!
Merc 1: that was such an uhuhu moment!
When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).