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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

Words related to outbreast

boobs bra breast breasts competition moobs tits unbreast