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Boob to body ratio, a mathmatical representation of the size of a girl's breasts. It means how big a girl's boobs are in comparison to her body. The higher a girl's boob to body ratio is, the bigger her boobs are in comparison to her body.
Wow, that girl has a nice set. I'll bet her B2BR is really high!
by JT2345 April 14, 2010
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