A person who has all the bad qualities of a nerd
or a geek
, but without their good qualities (solving Bessel equations for fun, programming in assembly language, writing device drivers for a toaster or making loads of money) - he just looks and acts like an idiot, has no social skills, can't get laid and has big glasses. A nerd sits behind his computer doing something that requires brains, while a dork just surfs the porn websites and chats with other dorks on some web forum. A geek or a nerd looks like a dumb ass but in fact has Mensa IQ, while a dork looks like a dumb ass because he is. A dork is, almost without exception, someone's bitch
, he's unable to have sex so he usually dies a virgin, and thus seldom harms the human gene pool. Dorks sometimes try to associate with geeks and nerds and act like them, but they are sort of a joke. They also try acting as if their condition is a matter of choice, ie. they don't have sex because they are into celibacy, they are out of shape because they're too intellectual to exercise, people don't understand what they're saying because they're so smart (and not because they are unable to form coherent sentences) etc.