Top Definition
Boob to Body Mass Index. The numerical approximation of a female’s breast size in comparison to her frame. B.B.M.I. is a vital component of hotness, considering that a girl can have outrageously large melons but be quite unattractive due to chunkyness.
Dude! Crazy B.B.M.I. at 3 0'clock!
by T-Moo January 14, 2006
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