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a larger, more attractive, perky breast or pectoral muscle, that is more aesthetically pleasing than the other.
"Wow Kara! when you stand to the side, i can only see your one glorious showboob, and not your smaller boob!" or "Oh my god. that girl's implants look so bad, at least she has a showboob."
by mattybeautiful October 18, 2009
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