Ryan King writes:
"I was on Xbox Live a lot playing Left 4 Dead over Christmas and heard a phrase being said a lot after December 25th - 'Christmas noob'. Make a mistake, you're a Christmas noob. Friendly fire someone, Christmas noob. Lag a couple of steps behind the group? Christmas noob.
While the onset of January has seen the 'Christmas noob' phrase has died off, the underlying implication is still there - you suck. And the Left 4 Dead community is slowly developing a hardier edge to new players, that could end up putting those new players off.
In the same way you can spot good players a mile off, you can also spot new players as they don't melee their way out of trouble and always break away from the group to run back through the level on their own to search for items. It's not really their fault as such, as they're new and won't necessarily understand the nuances involved."