hipster
Someone who is part of a teenage subculture. For example skaters, hip-hoppers, mods, hippies, emos, jocks, ravers, metal-fans, rockers, geeks, punks, nerds, couch-potatoes, demosceners. 

These scenes usually have adapted to a certain style of clothing, music, sports, behaviour which the teenagers following that scene support, as opposed to the mainstream teenagers who wear expensive clothes from brands known for child-labour, music dictated by the big music companies, thinking they are unique that way and making fun of the "hipsters" because they go their own way.
"Look at that emo guy over there with his thrift shop clothing, totally a hipster"

"So what, at least he's not walking around with $200 Evisu jeans and an iPod like you do!"
