seems there's always a lot of talk and mention and all about "hipsters". what do ya'll really mean when you refer to the rubric "hipster". is it kinda like justice brennan's quip about pronography--you can't definitively define it but you know one when you see one? really. and specifically what is a "hipster" vis a vis cycling? are all fixed riders hipsters per se relative to say road or mountain cyclists? what up?