Newbie

newbie, n. pejorative term for a player who is new to gaming. See munchkin, noobie beggar. [GJ1] also noob, newb
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Addendum: Face it, everyone has to go through the awkward phase of being a new person in social situations; tight-knit subcultures such as gaming are notorious for harassment of new people. This can generally stem from a combination of unfamiliarity with the new guy, testing the his/her limits, and "hey, I went through the same thing when I was new". Obviously, once the "newbie" has proven themselves, the "title" is retired, or passed on to the next new guy.
Addendum #2: The anonymity of online gaming, however, seems to cause all sorts of undue flack for new people as people who've been around for a while figure they can unload on the "noobs" without fear of heavy retribution. This is a problem facing many people trying to break into a game.