excl. Vocal simulation of the sound of a vaudeville trombone, used to denote embarrassment or misfortune. More often directed at others than used self-referentially.
Person 1: I waited in line for six hours hoping to score the midnight release of the PS3, but by the time I got in the store, they were sold out.

Person 2: Bwah Bwah!
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an imitation of the music that underscores adult film. Originally used as an introduction in IRC rooms and bulletin boards, it has evolved to include the physical act of sexual intercourse.

The phrase originally included, "*ding dong*", "Pizza Delivery", and "bwah-chicka-bwah-bwah" (in that order) as a representation of how a typical low-budget adult film would begin. It was later shortened to just "bwah-chicka-bwah-bwah".
Poster #1: *ding dong*
Poster #2: Pizza Delivery!
Poster #1: bwah-chicka-bwah-bwah!
Poster #2: LOL

You know what I'm sayin'! Last night I got me some bwah-chicka-bwah-bwah!
by Dwight (no relation) October 8, 2005
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a term used by children with hearing impairments, it began by being referred to a boy, but has evolved into it's own language
hey bwah bwah, here you go bwah bwah
by justin miller November 16, 2003
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