Top definition
Stands for "Not Gonna Say No...". It is used as a reply when you are asked to do something, and its something you want to do. A clever way of saying yes.
Allison: "Hey do you wanna go out tonight for some drinks?"
Me: "I'm Not Gonna Say No..."

Via Text/Twitter:
Original Text: "Would you hook up with him?"
Reply: #ngsn
by Bertesacker February 26, 2014
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