A person who wears a cock-eyed ball cap with a perfectly flat bill perched askew on one's head. Pejorative.

A fad originally started by black "urban youth" which denoted prosperity (because new hats have unformed bills). Leaving the price tags and labels on was common as well, indicating that the wearer could afford a new hat. This falls under the social phenomena of "nigger rich".

Like most "street fashion", this style has largely been appropriated (or stolen) by privileged white hipsters who want to express solidarity with black urban youth, and indicate that they too are "hard" and "from the streets".
"It's so ironic to see so many lily-white flat billers cranking hip-hop in their monster trucks and jeeps."

"Why do Flat billers even bother to wear caps? They fall off their head when they lean over and they definitely don't keep the sun out of their eyes... Maybe it's to keep their ear from getting sunburned when they are driving?"
by Leisure Class Hero November 30, 2009
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Same as Bro.

{Stupid white trash guys in the 909 with lifted trucks, wife beaters, shitty music (usually the most popular rap, hardcore, and nowadays emo) ugly girlfriends, ugly hair, mouths constantly open, retarded as all get up, have no common sense, think its cool to park half on the curb half off, put Flowmaster exhausts on Nissan Hardbodies and Toyota longbeds, don't realize that a huge lift job and giant tires fucks up your gears, which in turn equals less power. Fags.}
Dude, did you see those Flat-Billers at Pismo yesterday?
by Meeklo April 16, 2007
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