Noobs are not newbies.  Noobs are chatspeaking, foolish, nit-wits who's only pupose is to make other people miserable and to argue with other noobs.  Newbies are people who are new to something and they might not know about rules and other things.  If someone is a newbie on Wikipedia, they might accidentally vandalize an article (like adding something that might seem too opiniondated), while a noob would porposely vandalise an article for fun.