as rl is not american series and movies, being tall does not make a non-nerd. so i guess you are a nerd (congratulations? my condolences?)
[boring stuff following:] some of my friends can be considered nerds, too, and none of them is small, skinny or fat, and they all know how to wash their hair. then again, maybe they aren't that much nerdy, as they go out, too. as in discos, bars, pubs, you name it.
...except for one of them; only recently he chose to become a basement-dweller. aged almost 26, he moved to the basement of his father's house a couple of months ago, and eats pizza and canned ravioli, he sometimes has fatty hair, and he does not go out. ever. he studies informatics, and he if he's not at university, he's watching animes or plays videogames. [/boring stuff]