Someone who sits in the back and talks to no body; usually someone who says he hates human interaction, but is always making a scene.
Kid 1: Man, have who ever heard the quiet kid in the corner, QKC for short, talk?
Kid 2: Dude, he doesn't talk to anybody, he's got some kind of secret language.
QKC: No ablah espanhol senohr, keen ablah espanhol akey?
Kid 1: Wow, i can't understand a word he's saying