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.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi