A person who is obsessed with their image (whether it's trying to be a nerd or a hipster) and comes off as socially awkward and violent. Pretends to be smart but is actually failing all their tests. Or pretends to be stupid, but is actually a genius except they're failing all their tests on purpose. If not in school, they are probably pretending to have a job and a band and a life but are actually living in their parents' house and surviving off of thai food and crappy video games from the 90s. Basically, somebody who is trying to be something they're not and are socially excluded because of that.
Dork 1: Hey, I got 100% on my math test! Damn it, I'm such a nerd.
Dork 2: Dude, you cheated off my paper. I'm smarter than you. You can see from my glasses.
Dork 1: But they don't have any lenses.
Dork 2: How about a game of Viva Piñata?