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An old school slur for white guy used most notably by Richard Pryor.
White guy: "Exscuse me, but do you know where I can find a liquor store and a KFC?"

Black dude: "Fuck you flat ass!"
by Aaron Brace October 24, 2005
flat asses are now popular amongst black women......
not to many black women have big asses most women in the world have flat asses mostly black and white girls.
damn that bitch got a (flat ass).

flat cardborad look like shit
by Lee_Lee dat girl October 19, 2007