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1.
(n) portmanteau of douchebag and biker.

Class of bicycle enthusiast known to ride custom fixed gear bikes. Usually seen with one pant leg rolled up and wearing a Timbuk2 or Chrome bag.

Also see: http://yamabushi.files.wordpress.com/2007/07/fixiecliche.jpg
"Did you see all those douchebikers riding on Valencia St. this afternoon?"
by rowborg August 27, 2008