In a common sense, "Indie" stands for a musical stream of bands who use influences of different older bands (mostly from the 70's, 80's). Most of them are considered "pop", but their music is "handmade" and they often belong to small record labels. They also express their independence in creative clothes etc.
I think you can be indie in many different ways when you
- don't do something just because everyone else does it.
- create your own favourite style in music, clothes, ...
- build up your own opinions and stand behind them.
Cool Kid: So what music do you listen to?
Indie Kid: Oh, there are many styles I like... i think Franz Ferdinand are very catchy at the moment...
Cool Kid:I think the new album by Good Charlotte is awesome.
Indie Kid: I used to listen to this band when I was 13, but now I'm a bit outgrown.
- silence -
Cool Kid: I heard you are also into Indie?
Indie Kid: ...
Cool Kid: I recently bought some CDs by Adam Green, he's so cute and so indie... But his music is really lame, I think.
So do you want to have them?
Indie Kid: (chuckles to itself) No, thanks.