Yah is officially the coolest way to say, yes. It can also be used in other ways such as anger and excitement. It is pronounced yaaaw. Screaming it is also appropriate to show exciment, as if riding a horse.
Dub - Hey Ted, was Craig pissed about what happened earlier?
Ted - Yaaaaah
by Ted February 21, 2008
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Straight in someone's face,proving a foe wrong,or just simply outdoing someone.
"Dominoes MuthaF*cka!Now who's da man! Boo-YAAAAAH!"

"Boo-YAAAAAH Beeeeotch".I got yo man now ,so what you gonna do about it,hoe?"
by Jason May 3, 2004
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