way-hay
An expression of delight, ecstasy, satisfaction and self-achievement, all in one. Is normally exclaimed after:

a) Someone trips up
b) You pull someone's tie and the knot gets really small
c) You manage to pull the zip on someone's jacket

Person X: "Good day, Person Y. How are you?"
*Person Y pulls the zip down on Person X's jacket*
Person Y "Way-hay!"
Person X "Ahhh, ya bandit, you're gettin booted in the face"