the name for a person with a very flat chest. usually very offending to most girls who have no boobs.
A: ew. look at that tiffany girls myspace picture.
B: i know. no one wannts to see her in a bathing suit.
A: and shes pressing her arms together ro make it look like she has boobs.
A: she is so flatchested.
by Alexa H August 24, 2006
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