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1.
adjective describing a woman with no breasts, that is, flat-chested
"She was a carpenter's dream; flat as a board, and easy to nail."
by Jake March 06, 2004
 
2.
no breasts
Sue was flat as a board so I nailed her at my workbench.
by Jake March 06, 2004
 
3.
a term describing a girl with no boobs. very offense in most cases
hey tracy your flat a board! When you gunna start looking good? you ugly!
by jonathan July 12, 2005