Annoying 120lb toothpicks running around in tight trousers and even tighter t-shirts.
Tend to (falsely) believe they're witty, eccentric, and refined, when in reality they have zero interests of their own and need to cling on to anything viewed as "uncool" to have something to talk about.
They're very head-strong, particularly when it comes to politics, an area in which they view themselves as enlightened.
Love to read just for the sake of it; they rarely take anything away from the texts. Chomsky is a favourite, as is Voltaire.
They also write -- most will attempt poetry, or a novel, which will be set in a far-off fantasy world with characters named "Takeshi" and "Riku".
Music-wise, hipsters love anything which isn't popular: mainly indie bands straight out of the sub-urban garage complete with nasal American singing and vain, repetitive lyrics.
You can usually find them in Starbucks
on a Tuesday morning complaining in their blog, attending local protests (they have to maintain the image of being rebellious), or crawling around in the woods taking photographs of dead leaves.
Hipster: Look at me! I'm wearing tight black trousers with PINK striped socks and *blue* hair! I'm so eccentric lolz.
Hermit math wiz: No, I'm eccentric: I live with 200 cats, eat their food, and have a 163 IQ.
Hipster: Am I a connoisseur or do I just have too much time on my hands? You decide! ;)