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
Any grenade launcher attachment used in Call of Duty Modern Warfare, employed by n00bs of the highest caliber.
That n00b wont stop with the fucking Noobtube!!!!
by that nigga cross the street November 21, 2011
The art of using a rifle mounted grenade launcher. Commonly used in such video games as the Call of Duty franchise. This action in the gaming world is frowned upon by the more advanced gamers as it is most often used by "noobs" or gamers new to the game.
When playing Call of Duty; Modern Warfare 2 and you're on a decent kill streak and another gamer, of a lower rank, launches a grenade (via noob tube) in your general direction, without any sort of aim or skill, and kills you by sheer luck.
by powdrtostman December 11, 2009
gay expression used by people in call of duty when they are tremendously embarassed by getting owned by a grendade launcher. If you get jealous, use it urself retard
When somebody in cod gets embarassed about getting shot by a grenade launcher, they get jealous and start to make fun of the person who owned them by saying "NOOB TUBE!"
by bluedevils1206 December 22, 2009
a term used for either a virgin with a small penis or just a small penis
Girl: i had sex last night

Girl's Friend: how big was it?

Girl: He had a noob tube
by THe GaMe SOn!! January 16, 2010
A common term used on Halo 3 for when one uses the sniper rifle to remove the shield of an opponent and then switches to a battle rifle or carbine to finish off the kill for an easy head shot.
OMFG this fucking BK keeps using the sniper and br and he continues to Noob Tube my ass.
by FurY DA SnipeR October 25, 2009
A weapon that is often employed by someone who is "new" to an FPS game and needs to use the maximum ammount of fire power just to "try" to survive, because noob's have no skill. Usually a Bazukka or rocket launcher. Hense the term "noob tube".
Maj. Poopinschaft: " Hay you killed me 10 times in a row....
I think I'll get you with a bazukka, because I have no skill ! "
cartOOnman: " Go ahead, Get your noob tube, I'll still bash you over the head with a 45. NYUK NYUK NYUK MUUhahahahahaha "
by Pat " cartOOnman " Collins January 14, 2007
a word that is used for weapons in online games i.e. wolfenstein (panzerfrost), halo (rocket loncher / fulerod gun), counter strike ( auto shotgun bleve it or not).
1. omg i hate noobtubes.
2. i rock with the noob tube.
3. i am going to go crazy if i get owned agen by that noob tube.
by bobfishkins September 19, 2006

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