look up any word, like cleveland steamer:
 
29.
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
 
30.
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
 
31.
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
 
32.
(-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
 
33.
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.
"IT'S A TACTICAL ATTACHMENT!!!!!!!QUIT USING IT LIKE A NOOB TUBE!!!!"
by Gamer117 December 11, 2009
 
34.
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
 
35.
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