n00bilating
When a bunch of weaklings try to act cool by making a newbie look silly, usually because they're too dumb to realize they're the ones who suck.
Hey look at that noob, he doesn't even know what a keyboard is!
That kid just joined, and he already has 100 kills? Pfft, he's faking it.
You think you're good? Wait till I show you what real gaming is.