hipster

Short definition from Wiktionary

Noun

1. 1
   A person who is keenly interested in the latest trends or fashions.
2. 2
   A member of Bohemian counterculture.
3. 3
   An aficionado of jazz who considers himself or herself to be hip.
4. 4
   A person who wears a hip flask (of alcohol).
5. 5
   A dancer, particularly a female one.
6. 6
   Underwear with an elastic waistband at hip level.

Verb

1. 1
   To behave like a hipster.
2. 2
   To dress or decorate in a hip fashion.