A fork of Rural Dictionary
On Craigslist and other personnel sites, NSA stands for No Strings Attached or a romantic/sexual encounter without further obligation. If the "S" is replaced by a $ it means that payment is expected or, more simply, the person posting the ad is a prostitute.
Looking to give oral, N$A, your place, car or local hotel.
The MSN Messenger code that displays a "thumbs down" emoticon.
Failure. (N)