nb is an abbreviation for "nose breathe".

Nose breathes commonly occur when you find something funny. Rather than laughing out loud, one exhales or breathe though your nose.
Example One:

Glenda: "most the time when I say lol I don't even lol."

Hilda: *nb* "niether do I just nb."

Example Two:

*Rudy's phone rings*

Hilda: *nb*
by archibaldtheconquistador May 11, 2009
(n) The transition phase between a n00b and one who is fully 1337.
n!b: @11 0f t3h n00bz b3 pwning me today.
1337: Y0(_) //\//\34|\| 70|)4Y?
n!b: w/e
by Johnathan Rivera August 14, 2006
A nerd beaner, a nerdy mexican
Wow max your such an nb.
by azzurra June 02, 2009
Nasty bitches,slut,or a dirty girl
Did you see all the NBs at this party
by #1 assassin October 17, 2010
Abbreviation for the phrase, 'Not bad' taking the n and the b for, nb!
Ryan: Hey mate, how are you?
Tom: nb, you?
by Agent-VIP July 04, 2005
Nigger-Beater; I.E. a good name for a night-stick or extra large Mag light, baseball bat, etc. (anything you'd hit a nigger with)
"After the fucktard was hitting on my girl, I felt obligated to bust his ass with my dedicated N-B."
by Fughedaboudit September 23, 2004
Abbreviation for not bad. The term NB comes from the Kanata Krew who one day decided to make their own lingo.
Did you like that movie we saw last night?

Yeah, I really thought it was NB.
by Kanata Krew July 07, 2004
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