A particular type of nerd that misconstrews real life with RPG (Role Playing Games) like World of Warcraft, Final Fantasy and other MMORPGs. They're whole existence in real life is to "level up"! They may pose as real people but traditionally are sub-human beings that don't shower, live at home don't have interest in the opposite sex and maybe one day will meet their "online RPG" counterpart for courtship.
Yo, look at that RPG Nerd overthere with his WOW shirt. He looks like a 15th level mage!