Any cyclist who blatantly disregards the safety of nearby pedestrians.

noun
individual defined by wearing excessively tight designer jeans, hooded sweatshirt (usually black) puma style sneakers. Usually seen riding and expensive fixed gear bicycle such as a nagasawa, san rensho, bianchi pista which has been outfitted with Phil Wood hubs, and Velocity rims of various colors. These posers give cycling and bike messengers a bad name.