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Also called "BROs" because they constantly refer to each other as bro ("Hey bro"), a flatbiller is a kid covered in silly tattoes, tries his best to be x-treme, has a raised truck, rides dirtbikes and needs to talk about dirtbiking when other people are listening. Havasu and Glamis are the common vacation spots for west coast flatbillers. The term flatbiller refers to the flatbilled hats turned sideways that bros often wear. Common flatbiller accessories are custom lowered older cars, iron cross/west coast choppers stickers, bandanas, white stickers on the back window of their "street" truck that show how x-treme they are. Flatbillers are only allowed to wear black. There is an entire webpage devoted to providing flatbiller examples... the name is very creative, can you guess it?
Two flatbillers involved in an intelligent discourse at work-
Bro #1: Hey bro did you see my new west coast choppers tat, now I really look like eminem bro.
Bro #2: Bro, that tat is crazy, bro, you do look like eminem bro. We look so different than everyone else that is trying to look different.
Bro #1: Yeah bro, when I go dirtbiking I will have to let it air-out with the nipple ring. We are x-treme individuals bro. Nobody knows how to party like us. Did I mention that we dirtbike bro.
Bro #2: Awesome bro, these tattoes are never going out of style bro. They are timeless bro, like that "Limp Bizkit" scar that you scratched into your arm in 9th grade, bro.
Bro #1: Yeah bro. I need to get out of here bro, we should go to Havasu this weekend.
Bro #2: Yeah bro, but payday is next friday and I need to sink all my cash into the 8-ball shift-knob on the '63 bro.
Bro #1: I hear you bro, we need to ditch this job and become union pipelayers bro. That would be x-treme.
Customer: Can I have the large fries please.
by DwightB May 04, 2006
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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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A flatbiller is someone who buys a truck, puts a large and ineffectual lift on it, then proceeds to offroad in closed areas, resulting in more anti-offroader sentiment. Many times, but not always, they are characterized by their flat billed mesh hat.
That dude in the F150 lifted on 33's was at Gordons Well bombing through the bushes, he's too much of a flatbiller and is gonna help the Sierra Club close the dunes.
by Frothy Mug February 12, 2004
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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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A flatbiller is a young male, who usually lives in SoCal Or NorCal. They are typically white and very proud of their race(Not racist they're PROUD). They are very confident in themselves, they're also very outgoing and love to party. Their style includes Dickies pants or shorts, a shirt with a logo on it(SRH, Metal Mulisha, Skin, Famous, KMK), A hat or bandana(sometimes both) and many tattoos and piercings. You often see them riding lifted trucks, jeeps, dirt bikes, and quads.
That Flatbiller has some bomb tats.
by DanKii909 August 07, 2007
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