A weapon in a first person shooter which all the newbs use because its easy to kill others with, or they aren't ready or willing to give another gun a shot.
In Rainbow Six 3, the Grenade Launcher is the noob cannon, most servers don't even run it unless they want amusement.
term used in first person shooters to describe a gun that is considered too easy to use and is used by noobs. most commonly used in counterstrike to describe the AWP/AWM(a powerful sniper rifle that kills with 1 shot). also used to describe the autosnipers and auto-shotgun, as well as guns in other games.
omfg u pussy!!!!!111!!1! put down the noob cannon¬!!¬!!!"! use a real gun u loser!
In Call of Duty its the PPSh which is a 71 round submachine gun that allows the player who is using it to spray his hot lead all over the place. Favoured by nOObs, hence noob cannon.
Jake PPSh'd Da Sniper
Da Sniper:U fookin newark stop usin da noob cannon and fight like a man Jake: NO!