That is the name for someone who is geeky, yet still pwns. In other words - noob and pwn and biscuit combined. Not nerdy and not even necessarily noobish, just geeky. Usually refers to band geeks or people who associate themselves with band geeks.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.