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2.
A declaration used when a person does something that they think was amazing while everyone else knows it was practically a miracle.

can also be used as a verb "to boom bitch" as in the act of doing something so stupidly surprising - or as an adjective to describe something miraculous
Kosta Koufus went up for a shot and was totally rejected, but the shot went in anyhow. He was so pleased with himself that he ran down the floor exclaiming Boom Bitches!
by moeville April 30, 2010
 
1.
What one may exclaim after doing something that humiliates another person. It may also be said after completing a task someone deemed impossible.
You just got your ass kicked! BOOM BITCH!
by Paul9 June 20, 2007