What does noob tubes and pro pipes mean?

a noob tube is another word for grenade launcher, noob tubers are people who use them constantly, they never fire a bullet, yes i use them, but not like those bytches, they fire that thing right in your face, point blank, and they usually have either scavenger (or one man army), danger close, and i dont know what the other one is, its called a noob tube, since its the first thing that is unlocked for a gun, all of this is referenced to modern warfare 2, since black ops, its more harder to noob tube, pro pipe is another name for it, havent heard that in awhile, but if a noob tuber calls himself that, he is probably trying to make himself feel better, i guess i would be a pro piper or whatever, since i use the grenade launcher the right way, and ive seen scarface, so yeah, i like the grenade launcher on an M16