Onomatopoeia often used by furries in any context in certain cases correlated to femboys, bottoms or transfems. "Bwaaa", like many of its variations is used to reiterate the regular "bwaa" the first being used to convey the same sound while also elongating it for added effect.
The catchphrase of Dave Chappelle as Howard Dean. It includes punching your right hand to the top-right about 45°. Dave himself also does/says this at sexual climax (orgasm).
(On the subject of gay marriage)
Dave/Howard Dean: "Well, I think that when talking about this issue, we have to remember that Mr. Cheney has a lesbian daughter. Not only that, his mother's a lesbian and his sister's a lesbian, and his greasy granny has holes in her panties! Byaaah! I. LOVE. LESBIANS! Byaaah!!
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.