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A gaming term for an under-mounted grenade launcher such as the M203 or any other kind of launched explosive (RPG, Thumper, etc) used in first person shooter games such as Call of Duty: Modern Warfare 2 or Battlefield: Bad Company 2. Use of such a weapon to get kills is considered 'cheap', since it requires very little skill to use. 'Noob' is a term for a newcomer to a game, and is used as an insult in gaming communities.
Damn, that noob got me with his noob tube for the eighth time this round!
Noob Tube by ecyrblim April 10, 2010
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Noob tube douche 

Any douchebag that uses the grenade launcher as an attachment to assault guns in COD 4 modern warfare. This weapon shows off the douchebaggery and lack of any skill what so ever.
Dude get some skills and stop using that bullshit, you noob tube douche.
Noob tube douche by whiskey13 January 23, 2009
Reference to a grenade launcher type weapon featured in several warfare silmulation games, both online and offline.
Takes very little skill to use and can kill whole groups of enemies with a single indirect hit, yet the explosion needs to be fairly close.

To be used liberally against elitist gamers who play games all day because they can't get jobs and whenever they can't win they start crying. Much amusement to be had reading their abuse.
Player 1 dies from grenade launcher attack.
Player 1 responds: "omfgwtfbbq you noob tubed me again you f&(*ing noob go have intercourse with your mum blah blah blah blah blah!!!!11!!!!11111"
Noob Tube by Goulderchauf April 14, 2010

noob tube for the win 

When a person uses a n00b tube (grenade launcher) to win at a video game. Never takes any skill at all and people always complain.
Eric: " noob tube for the win."
Cavs: " wow no skill use a real gun."
Usually refers to the grenade launcher in Call of Duty 4 due to it's high power and wide kill radius, and especially it's easiness to use.
Alex over the headset on Xbox live:
"Dude, this kid with the noob tube killed me like 6 times already, its really pissin' me off!"
Noob tube by Jboydope June 9, 2008

noobtuber 

This refers to a derogatory word used for an online gamer in, xbox 360 and ps3, in two different games. The word noobtuber is often used while playing call of duty 4 live, when a player uses grenade launcher attachments on all of their weapons in order to get cheap kills. They usually cannot get kills any other way. It also refers to halo 3 or halo 2 live, when a player uses a rocket launcher and/or a missle pod, and repeatedly uses it as it keeps spawning.
call of duty 4 example:
Lvl 52 Prestige: That fcking noobtuber keeps hitting me with the m16 launcher when I'm sniping. Someone call a UAV already so I can kill that biatch!

halo 3 example:

Col. Grade 2: Stop spawning our rocket launcher at our base you freaking n0obtuber. This is why covies suck: noobtube central
noobtuber by $T&G$ April 14, 2008
also spelled as n00b Tube

Term widely used in the online gaming community for any kind of Rocket launcher, Most commonly used by gamers who beleave the weapon is very effect in many situations, Some also call the person using the weapon, Cheap, or Lame, or what have you
Damn, My ass just got blown up by that cheap ass noob tube
noob tube by Mike Schwartz December 30, 2003