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
Another name for a grenade launcher. Called a 'noob tube' because in video games it takes a little or no skill to get kills with and the grenade launcher is shaped as a tube. People get pissed off everytime they get killed with it.

Player 1: *takes noob tube out*
*fires at player 2*
Player 2: *turns off his computer*
by Rager Helix October 17, 2013
A tube in which noobs use to devestate their opponents.
Aw dude he just noob tubed me.
by Atlas XII November 02, 2008
The Grenade Launcher attachment for all Assault Rifles (Except MP44) in Call of Duty 4: Modern Warfare.
Stupid Noob Tube whore!!!!
by Fertro May 30, 2008
The ridiculously overpowered underslung grenade launcher featured in call of duty
Oh my god!!!! He noob tubed me *extreme rage*
by miniman247 February 26, 2014
When some fucktard feels the need to kill with a grenade launcher or bazooka on COD because they were accidents born on the M20 and have no skill
Fag, fuck you, bitch u just noobed me, noob tube
by taylorkid111 March 01, 2012
A grenade at a party who waits till you are very drunk and just keeps on coming at you in order to try to hook up with you.
Man1:Shit man Jon was Noob tubed at the party. I felt so bad for him
Man2: Hahahahaha, she was so fat. Poor bastard
by DJ Comphy November 22, 2011
Some one who uses over powered weapons in modern warefare 2, halo 3 etc. Weapons such as a gernade launcher with danger close or energy sword with sprint.
"Fuck man I just got killed by another Noob Tube".
by brainfreze27 March 29, 2011
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