Any grenade launcher, be it an M203 or a GP-30, used on a video game. Specifically online on Call of Duty: Modern Warfare or Modern Warfare 2. It requires almost little or no skill to effectively get kills with it. Just aim in a general direction of wherever you think the enemy might be, and it'll get the job done without giving your enemy time to avoid it or retaliate.

Surprisingly, despite its name, it's not primarily used by noobs, or newcomers to the game. It's actually used more by assholes that are well into the game already but only use it to piss off their opposing team. And unfortunately, they usually do succeed in pissing off their enemy which could (and normally does) result in the enemy team changing their class to a noob tubing class while saying something like "Oh you wanna noob tube bitch? I can do it too", and that results in an entire game session being nothing but noob tubes and/or RPG's, depending on who's in the game.

Highly disliked by the majority of the gaming community. Avoid noob tubing at all costs to ensure that you don't start a tubing chain-reaction.
Teammate 1- DUDE!! This guy is using his fucking noob tube again!

Teammate 2- I swear to god. If i get tubed one more time i'm gonna bust a nut.

T1- Alright fuck this game....

T2- Come on. Don't rage quit.

T1- *disconnects*

T2- Son of a bitch *facepalm*
by StopTheTubing!!! May 04, 2010
A weapon attachment in Call of Duty 4: Modern Warfare and Call of Duty: Modern Warfare 2, commonly used by noobs that can only rack up kills using explosives.
Dude, stop using that noob tube
by 1337COW? July 21, 2010
A noob tube is an under barrel grenade launcher such as a M203 for English and American guns or GP-25 for russian and german guns
by Noobers February 09, 2012
(-noun) The attachable grenade launcher in Call of Duty: Modern Warfare and Call of Duty: Modern Warfare 2.

(-verb) Being killed by the attachhable grenade launcher in the Call of Duty series.
(noun) "Dude, don't use the 'Noob Tube', its hella gay"
(verb) "Oh shit!!! I just got 'Noob Tubed!'
by Blatent Lack of Judgement July 22, 2010
A grenade launcher on modern warfare 1,2 that only douche bags and people with no skill use. They may only be used if you are trying to unlock the attachable shotgun.
That little shit just noob tubed me, what a douche
by Jon jane February 15, 2010
Any explosive device that is mounted to the gun in a game.
Good for firing at multiple enemies coming around a corner.
Bad for firing at one guy who can be easily dispatched with one bullet.
by Gamer117 December 11, 2009
Despite many saying that this is something specific to Call Of Duty 4 it is in fact a general term for any weapon that is cheap and/or over-powered in any video or computer game, usually a grenade launcher or RPG but also, especially with newer games, can be a shotgun (i.e. Call Of Duty, Half-Life 2, Rainbow 6) at least when up close. Use of it is commonly frowned upon unless used with some finesse or tactical forethought.
Tom: "Dude, I was playing Halo 3 the other day some dude unloaded on me with the Mini-Gun."
Harry: " The Mini-Gun is such a Noob Tube"

Dick: "Gosh that guy just shot me with a Noob Tube."
Tom: "What a Noobish thing to do!"
by Xynocron August 09, 2009
Used in a very few servers on CoD4 and probably a variety of other Online FPS'. Usually servers that have decided to ban the use of the M203 Grenade Launcher.
(CoD4 Context) Remove the Noob Tube.
by PHR4G November 04, 2008

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