According to an article in the Metro you are a geek if five of the following statements apply to you;
I love (insert specialist subject - e.g. music, film, fashion, cars - here) I know shed loads about my thing I can talk for hours about it I stand out from the crowd Other people come to me for info I don't follow trends I set them I am the first to know
They then discuss the different types of geek found throughout the ages and theorise what geeks in the future might be like. Before finally concluding with how to enbrace your new-found geekyness. This you achieve by realising what your passion is. Then spend time and money on it and finally talk about it.
So there you have it. An abrieviated guide to geekdom.