"HIPSTER"

The other day a coworker looked at my last.fm page and called me a hipster. I seriously dont mind, but a true definition of this term has always eluded me. It seems like people throw it around only for the effect that they know that comes with it, without the term having a meaning that anyone can specifically enumerate. My belief is that term would describe someone who only likes stuff because nobody else likes it. But the fact that people use it to describe people who look and act like other "hipsters" really defies the sentiment of the term. So either I'm wrong or everyone who uses it that way is wrong.

Without regard to the term's definition I had some poignant thoughts in reaction to its use to label me. If I seek out music that isnt popular, that would mean that I would have to know what is popular, to be able to avoid it. Therefore I would be paying the same attention to popular music as most people are, if not more. So in a way the term accuses me of doing what everyone else does only to portray that I am in fact only interested in everything but that which is popular.

Am I wrong here or what?