One who plays World of Warcraft. So far the nerdiest, most time-consuming, and life-stealing video game ever made.

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)

Someone who is so skilled at wasting their life at minecraft they have called themselves MLG