I am a nerd according to the most concise definition avalible of it. I play games (and have done since a) I was a child and b) before it was fashionable to do so), I used to play Warhammer 40k (Space Marines rock, anyone who says otherwise shall be publicly executed by yours truely) and presently play DnD (I am usually a Paladin), most of my T-shirts have game related phrases written on or logos from games and I posess (and frequently read) a large number of graphic novels.
Other features of nerdiness I have are: social awkwardness, the closest contact I have had with my girlfriend is via MSN and Xbox Live (doesn't help that she's in another country), I posess both a light beard and medium length hair, I wear sunshades indoors and at night time because I think they look cool, I wear bright hawaien (I don't know how you spell it) and oriental shirts all year round, I write on a gaming forum and have posted reviews online, I still watch cartoons sometimes, I go to college and I am very much sexually repressed (although, in all fairness I am English so what more do you expect?).
So to answer your question, I am a nerd (I could even run for the position of Alpha nerd if I really felt like it).