I had to find out what “n00b” actually meant. It apparently just means newbie. I apologize for getting defensive in my response.
Here is some of the etymology of n00b:
http://en.wikipedia.org/wiki/Powned
Basically, "p0wn3d" was a fat-fingered rush to gloat over an opponent's defeat in an online game, very similar to the rush of exultation as you triumphantly trick and checkmate your opponent in a game of quick-chess.
From this word devolved the use of numerics in many online slang words - n00b or n00b13 being one form. It's also common practice with some to substitute a numeric in a swear-word in a FR post.
Occasionally, someone will post the freeper lexicon. It’s a huge post, that will normally get bumped to several hundred posts whenever a new thread of it starts. I can’t seem to find it with searches. Perhaps someone else here might have a reference for you. It’s a great read and really goes into all the acronyms and weirdness that permeates FR.