people who crave attention/security and try to obtain it by being unnatural or "counter-culture." Often they dress in vintage clothing or random articles of clothing that would not be worn usually at that time. ie: a skull-cap during the summer or not suitable clothing for a certain occasion. Frequently hipsters meet people by being different and usually become friends with that person until they must appear "counter-culture" to the rest of the world in their attempt to meet more people and gain a false security in a group. Most do not have friends and are often seen alone in an unfamiliar environment or dazing off in the distance with company of another person(s).
See that weirdly dressed girl staring off in the distance? I bet she's a hipster.