someone who shoots a grenade out of a grenade launcher on a gun across the map found in call of duty 4 and modern warfare 2
guy#1 he killed me with a grenade from across the map
guy#2 what a NOOBTUBER
by ADD ME ON XBOX- DumberCheese November 27, 2009
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The name given, by players of the game CoD4, to the assault rifle mounted grenade launcher do to the fact that it is seen as requiring little skill to use and the fact that it is, in fact, a tube.

Also, the use of said grenade launcher.
(JWilkesBoof kills HonestFive with an M203 grenade)
HonestFive: "Oh come on man don't noobtube!"
by Abhorent Aardwolf April 16, 2008
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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
by $T&G$ April 15, 2008
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A gaming action used in online shooters (i.e. COD MW2, etc..) involving the use of a rifle mounted grenade launcher to achieve easy kills.
Xray-479:

"Awesome, check out that replay, got you with my launcher from across the map while in a prone camping position; I am the luckiest nube ever"

TBAG: "Dammit, there goes my f----ng kill streak, damned noobtuber"
by SGT-T-BAG June 4, 2010
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A grenade launcher mounted underneath a gun, most commonly an assault rifle, in Call of Duty games. The word "Noobtube" comes from the player using it being a "noob" and the fact that the grenade launcher looks like a tube; hence the word Noobtube. Noobtubes carry 2 grenades that can also be refilled using the Scavenger perk or the highly despised One Man Army perk. They have a very large blast radius and enormous damage, leading to one hit kills even if the grenade lands 10-15 from the enemy. The most hated thing you can do with the Noobtube, is to join a domination game and shoot the Noobtube across the map at the beginning of the game into the enemies flag closest to their spawn, earning a 2-6 hit kill with one shot. The players using the Noobtube are called Noobtubers and are hated by many players in the gaming community because of the weapon requiring little effort to get kills with because of its high damage and blast radius. A Noobtubers K/D is usually quite high and they commonly achieve higher ranked killstreaks, (Pave low, Chopper gunner, AC-130, ect).
(Immature enemy)
Noobtuber kills enemy-
Enemy: OMG! Learn how to use a gun you dumb faggot Noobtuber!
Noobtuber: I'm just trying to play the objective and get kills, chill!
Enemy: (rage quits and joins a new game)
(Mature enemy)
Noobtuber kills enemy-
Enemy: (grunts in annoyance) that Noobtube is annoying but is is a weapon in the game and he is allowed to use it.
Noobtuber: Thank you! Someone understands! Want to be my friend?

Enemy: Sure!
(Noobtuber and enemy become friends and start a clan)
by Infernostar December 25, 2012
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When some fagg on Cod uses a greanade launcher and kills you
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Person who uses a grenade launcher in the call of duty series who sucks balls
stupid noobtuber spawn tubed me and got a multikill..........faggat
by noobtubee May 14, 2010
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