I think that if you are really passionate about something specific that makes you a geek, although I might add a qualifier that it generally has to be an intellectual pursuit.

Most importantly, being a "geek" is not about an image, it's a way of looking at the world.

True geeks don't go around telling everyone they're a geek. That's all posers do. Geeks, it's just who they are. It's not a fad, or cool thing used get noticed. Geek is a personality type, you are born with it. It's not something you can buy at the store.