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1.
NSG
Stands for: Not something good
Joey: Michelle Pegasus was pissed at me so she hit me with a car..That biatch =)
Duke: Well...that's NSG...
Tristan: Glad she doesn't like me! Because I'm a minor character!
by Misu Devlin August 24, 2006
 
2.
NSG
the name of the pound for criminal and socially harmful animals
once you go anywhere near NSG ur eye's will start to burn, ears start to throb painfully and u'll wanna run as far away as you can
by pimp November 09, 2003