Haaaaoooyeeeahhh!
A loud, stupid yell that comes out of someone's mouth when they're happy, usually during sex or when they see their team win, but sometimes just to be a total idiot.
She let out a Haaaaoooyeeeahhh! when she got her first raise at work.
The kid in the front row yelled Haaaaoooyeeeahhh! when the teacher said no candy for the class.
He screamed Haaaaoooyeeeahhh! in the middle of a movie just because he felt like it.