An enthusiastic jeer where the prolongation of the end of the word depends on desired effect. I.e. whuaaaaaaa/wuaaaaaah
It is usually used for hilarious outcome or general day to day use. The expression is derived from the mating noise of a species of bird and the immaturity of school kids. The more you use it, the better it sounds.
Example of proper use of the word:
Facial expressions may also be used for emphasis.
"Whuaaaaaaa, yo momma gimme juice!" or "I fell off my bike" "whua (wuah)!"