An Ultimate frisbee player. The "ball" in this case is a 175 gram Discraft ultrastar.
I am going out on a date tonight with a gal who's a flatballer. (or) That flat baller can boat race.
by Imaginablemedium February 03, 2012
to be a flatballer is to not quite be a complete "baller" or "balla". Someone who tries to fit in with hip hop gangsta crew, but cannot quite do it.
aka Carlton from Fresh Prince of Bel-Air is trying to be cool like Will but he is a Flatballer
by flatballerexpress November 25, 2009

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