A person who intentionally displays poor grammatical skills. These individuals are most prominant on the internet and online games and like to use acronyms such as STFU (Shut The Fuck Up), FTL (For The Lose), and and OMGWTF (Oh My God, What The Fuck). They will use these mash up of words at any and all given opportunities.

In the gaming spectrum, a Noob is not someone who is new to a game. That would be a Newbie. There is nothing wrong with being a newbie as you have to learn somewhere. However, a Noob is a person who has had some experience with a game, but still plays it poorly, acts like an asshat, and insists that they are elite (1337 in their own words) and that everyone else in the game is a "noob." Yes. Noob is one of those few words where the word itself is actually part of it's own definition since anyone who even uses the word "Noob" in a serious manner is a Noob himself.
This is based off a true incident. It saddens me that some fellow hordies in World of Warcraft act this way.

Idiot: OMFG u sux! Ur gear iz FTL. I own u noob!
Me: Really now?
Idiot: Ya wutever. I r 1337! watch dis.
(The idiot proceeds to duel me in attempt to prove that he is superior, which ends in him being smeared into the ground and me standing over his dead body)
Idiot: WTF hax!
Me: Yeah. You were right. You sure are elite.
Idiot: STFU Noob!
by Drakeblade March 18, 2008
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Not to be confused by newbie, a noob is a person who cannot, or barely spell. They are most likely to get banned at anything, even a poorly moderated game/site/forum.
Noob: L0L i s0 culd b3t u

TehPro: At what?

Noob: @ gnz online of couse

*Noob got banned by TehPro*

TehPro: That takes care of that little noob.

Note: Do not try to interpret Noob's style of saying English.
by MisaTange July 5, 2009
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Someone who is new to something and will forever remain at that skill level.
The term is usually applied in the gaming world.
Characteristics include: terrible grammar, excessive use of numbers in the name, TYPING IN ALL CAPS, and begging.

Unlike the common newb, the noob is the person who manages to turn friendly, long-time players into assholes who'll make fun of anybody new to the system.

You can usually find noobs congregating at the starter zones or in major hubs in World of Warcraft, RuneScape, MapleStory, and virtually any other online game.
Newb:

Kevin7: How can I make money?
Me: You can make money from mining.
Kevin7: Do you know where I can get a pick?
Me: Sure, that shop over in the corner.
Kevin7: Thanks, I'll go try it.

Noobs:

freddy1312435: muny plz
Me: You can make money from mining.
freddy1312435: wat
Me: You want money?
freddy1312435: muny plz

jon199569: hgeal
Me: I can't heal you; I'm dead because you couldn't hold aggro.
jon199569: .............................................................
Me: ...
jon199569: HAEL MICH
by Duckboom October 7, 2010
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"Noob" is a term frequently used in online gaming, and pertains to immature ignoramuses with no grammatical/vocabulary skills. In technical terms, a noob can be referred to as an ultracrepidarian, inaniloquent, autohagiographer.
Every noob can be described as having one or more of these qualities.
Ultracrepidarian: A person who gives opinions on matters beyond their knowledge.
Inaniloquent: Speaking foolishly or saying stupid things.
Autohagiographer: A person who talks in a conceited manner about their own life and accomplishments.

Calling a noob an "ultracrepidarian, inaniloquent, autohagiographer" can yield interesting and often entertaining results.

An example of a noob being ultracrepidarian:

Noob: oh ya????? well ur ugly and hav no lyf! u jus sit at teh pc all day talking mean 2 ppl! U FAIL!!!11!

An example of a noob being inaniloquous:

Noob: roflololllollol omg ur such a n00b! i own ur FACE!!!!1!1!!~~~11!!

An example of a noob being an autohagiographer:

Noob: omg so im lyk rly rly rich and prtty and every1 lyks me and... etc.
by EchoSempai January 10, 2009
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Noob: A term used to insult people, offically naming them unskilled, worthless, pieces of garbage. Often used in video games such as:
Runescape
Maplestory
Combat Arms
Halo
COD 5
Gears of War 2
Blackshot
A way to find a noob:
A typical noob reaction, "Dude you hack"
A typical noob reaction, "Dude you suck"
A typical noob reaction, "Anything you do I can do better"
A typical noob reaction, "I can OWN you NOOB"
A typical noob reaction, "What the hell? YOU HACK!"
Noob actions:
Spamming
Profanity
Harrassment
Some sort of hacking
Glitching
Tapping
Team Killing
by NoobNubMania July 28, 2009
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One who is offended by this term.
John: "You're a noob."

Noob: "What!? What did you just call me?! I can pwn you boy with my 1337 skillz in Halo, GoW, WoW, CS, SC, MoH, BMW, YMCA, DUI, RDLGQ2UYZRT!! And-and also ..." etc.

John: "I rest my case."
by Blu489 February 22, 2008
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Noob = Idiot, Newb = New player / newbie
dude ur such a noob = dude ur such and idiot, dude ur such a newb = dude ur such a new player (low lvl/newbie)
by LADLEMAO April 22, 2010
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