The gay ass way that people wear their hats nowadays. They even leave on the gay ass round shiny stickers that tell you how small the casing for your brain is. You used to shape your bill into a curved thing that would fit snugly on your head...back when it was cool to wear a hat.
"Damn foo, look at all those wannabee gangsta's flatbillin it!"

"I can't believe you're using a flat bill...you used to be cool!"
by therealMarcos May 3, 2006
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A hat with the flatest of brims...not an ordinary baseball cap. Gives user high amounts of swag.
Look at that bro over there, he has so much swag in his flat bill.
by Chez. December 29, 2011
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The most retarded looking thing a human can wear on their head. Usually worn by teenage or mid-20something males to look "cool."
"Look at that tool over there, with the Flat Bill Hat"

"Check out my hat!" "Sorry bro, you look like a retard."
by Snarky48 June 18, 2013
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Some one who wears there hat with a flat bill backwards. Wigger.
Rodney is a flat-bill-hat-a-puss.
by twohearts May 13, 2009
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