Someone who likes gaming, computers/internet, and are into fantasy/sci fi-related (such as DnD or Harry Potter) stuff and considers themselves as a nerd. Like me! =D I'm sure some are into reading too, of course. It also helps to be interlectual, I s'pose, but not always, because I know I'm not. (XD) I think those who wear glasses look interlectual, and I like it, but that's just me. I wear glasses. Usually I find that my friends are nerds simply because of how they all have the same good intentions and use big words to describe things ...Or create their own. That's alright though, because I enjoy every second of being with them.
And it also helps to like anime in this day in age if you are a nerd/geek. And sometimes a little goofiness goes a long way. I'm an artsy person, and I love to draw.