Top Definition
To defeat one's opponent in terms of breast size. Female competitions can ensue, much in the same vein of men comparing penis size.
John defenestrated his 100% cotton shirt to discover he outbreasted his girlfriend Jenny.

Jenny wore a bra size DD while her friend Jane was an AAA cup. Jane was outbreasted by Jenny and abandoned by her friends.
by Leeeeee! October 12, 2006

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