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1.
used as an exclamation usually with an exaggerated hooking right punch; originally came from a speech by Howard Dean at a convention - Dave Chapelle later spoofed it on The Chappelle Show. Also spelled with an h at the end.
And then you and me are gonna go into your room, get naked, have some sex and byaaaah!
by OOOwatah November 30, 2006
 
2.
A roar of excitement thats in the moment. Usually used by white people; The roar let out by dean howard on his campaign trail. Also seen on Chappelle's Show.
Girl, you know I love you, I'm gonna take you home, make love and BYAAA!
by Devante May 10, 2007