Term Bungie has given for the new grenade launcher in soon to be released beta, and later new game, Halo: Reach.
ONLY CoD FAGS WOULD CALL IT NOOB-TUBE.
CoD Fag- STOP USING THAT NOOB-TUBE YOU LITTLE BITCH!
Awesome person- That's Pro-Pipe to you motherfucka.
Not to be confused with "bro-pipe", this refers to the rifle mounted grenade launchers in warfare games (see Modern Warfare 2, Call of Duty 4, etc). These can also be called "noob tubes"- though in some cases that would be an incorrect term.more...
Case 1- If someone uses a grenade launcher because they cannot kill otherwise- you would be correct in the assumption that it is a "noob tube".
Case 2- If someone uses the launcher because he/she is bored of the guns, and prefers to find more inventive ways to kill people (i.e. curving the ordinance through window frames, arcing at the right angles, hearing footsteps and killing someone who is around the corner, shooting a dud at close range to hit them in the stomach so they make that satisfying "ooof" sound) then that is not a "noob tube". Case 2 is a PRO PIPE.
In case 1- the user is easy enough to counter. Wait until he/she is reloading or force them into close quarters to truly test their aim. They only have one chance to dud shot you.
In case 2- it does not matter. Guns, knives, grenades- the user would have killed you anyways. You are their play things.
Generally- people have to have something to whine about on Xbox Live, PSN, or PC. Noob tube can be considered a derogatory term to those skilled enough to know the difference between cheesing out the grenade launcher and appreciating it's useful (yet slightly different from a gun) ballistic tendencies.