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1.
NGB
Short form for "Nice guy but..."

Descriptor of a guy you are not interested in, even though there is nothing glaringly wrong with him. Can be used to introduce a variety of usually minor flaws or reasons that said guy is not "it". Not overly critical, but is final dismissive.
Q: "So, how'd it go with Jason last night?"
A: "It was okay, not great - NGB."
by wordy40 January 31, 2006
 
2.
NGB
NGB = No Game Breaks.
The act of not taking a break from spittin' game. It is often a good thing to not take a game break, because if you do, it means that you have no game.
I saw you hook up with that girl bro, NGB dude
by pooze2012 November 16, 2010
 
3.
NGB
A person who, albeit a good person, is not desired sexually(Nice girl/guy but...)
Dude #1:U hook up with my sister's friend yet?

Dude #2:Yeah, but she's just an NGB
by satanhitler November 29, 2003
 
4.
ngb
ngb is an abbreviation for nogapsbetween, a band from cape town, south africa.
you may see their stickers around and wonder, "what is ngb?"
well now you know!
by nogapsbetweenslut June 17, 2013
 
5.
NGB
Stemming from the term "non-grouper basket", an NGB is a ridiculously hot female.
Yo Sean, check out that NGB!
by Vinnie P. March 19, 2008