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A mixture of the two Philly words boah which is used to describe a boy, and jawn which can be used to describe anything, in this case a girl. This is the equal of a transexual, or girl boy.
Person 1: That bitch got a fat ass!
Person 2: Ill you nasty. Thats a boah jawn!
by Lbs. December 23, 2006
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