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This is used to describe a woman with no breasts.

Simply, the nails are the nipples and the board is the chest.
John: OMG! Did you just see that chick? She's basically two nails on a board!

Craig: Kinda like your girlfriend?
by xXshadowXx October 29, 2008

Words related to Two nails on a board

board boob boobs flat nails