A douchebag of a person that is exceedingly annoying to the point where you're forced to vacate the room or slap the douchebag silly.
It's common for a newblet to perform outrageously stupid actions when completely sober. It's also a common occurrence for the newblet to talk absolute shit.
I'm going to slap that newblet if he says one more stupid thing.
Dude 1: "Dude, your mom is such a newb"
Dude 2: "So?"
Dude 1: "So, you're her little newblet son"
Dude 2: "Nu uh!"
Dude 1: "Yeah huh, you always suck out at Hello Kitty Island Adventures."