I'm a Hipster?

Thanks to Ian, I'm going to the Electric Six concert at First Avenue tomorrow; thank you Ian. : ) Only thing is, I have two tickets and Tony is working tomorrow night and is not able to get it off, but his fried Eric might be able to go with me. Don't know yet... My friend Joe will be there, so that'll be cool as I haven't hung out with him for a few months now? Sad.
And then on Easter Sunday I'm going to the Yeah Yeah Yeah's concert with Tony.
Heh, it's taken me a year and a half to finally get into the scene here and start going to First Ave.

So, I'm curious. What's a hipster? Because, I guess I am one? There's this guy who always comes through my lane who I've befriended, I guess you could say. I'm guessing he's in his older 20's and he has a gf and he told me one time that they both think I'm cool and in saying this, he told me he'd invite me over sometime to one of their outdoor movie showings that they do every now and then with friends. One time when he came through my lane, he told me about the little "hipster" sale that was going on on Central and 34th a couple months ago. And then just a few days ago, he and his gf were talking to me and...shit, I can't remember what we were talking about, but he had commented, "Well, you're a hipster aren't you? You look like a hipster."

What the hell is a hipster?