Heyhoo expression to react to something or someone that is not a big of a deal is gone.
As used in this GTA V text
(Trevor used to sell weapons to Wei Cheng then Franklin bombs Wei Cheng's car making him death, Franklin told that to Trevor)
Trevor replied: We won't have anyone to sell super-weapons to but hey hoo!
A derisive and cynical laugh with particular emphasis on the 'hoo' to indicate a particularly snide and sarcastic rejoinder to a bad joke or express deliberate insensitivity towards bad news.
A ridiculous response to a ridiculous stimuli.
News Reporter on TV: "Anna Nicole's baby's paternity is being challenged..."
Viewer: "har har hoo! Who da guessed it? Guess jeans!
Affects males only. The act of damaging near-at-hand objects in times of extreme anger or frustration, usin only the balls and their resident sack, which are swung in a bull-dozer type motion. Also known as scrotum inviciblus inus your face-us.
1-
Tom: Phil's gettin angry... and he's home alone.
Desmond: Dude, i hope he dont fucken hoo-haa the tv agen.
Tom: The tv? Wot about the dog?
2-
Fred: Hey Murph, wot happened to ur face?
Murphy: Was asleep last nite and Gary stumbled in fucking drunk and fucken hoo-haa'd me.
Fred: Then wot?
Murphy: No question about it, i went fucken hoo-haa.