Stands for No Secrets in America. The NSA is a large "secret" organization in America designed to accustom us to the concept of the Thought Police, so that when they do actually take over the world and implement absolutely totalitarian policies every citizen will already have been lulled into mindlessness and the illusion that Everything is Going to Be Allright.
(It's not.)

Hide yo kids, hide yo wife, hide yo husband...cuz the NSA be spyin' on everyone out there!
by Thornshadow August 19, 2013
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No Strings Attached; no obligations
A term used by a person to highlight the fact that this person, who is looking for fun or something else, does not want to bond closely/emotionally.
"I'm single, and looking for NSA-fun"
by RødGrødmedFløde May 28, 2015
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"Let's have a sexual relationship, NSA (no strings attached)" -meaning there would be no further commitment after sex
by Quinniecakes March 23, 2016
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see also Big Brother and 1984.

They listen to every radio transmission/telephone call/ etc. etc.
If it's got an antenna attached to it, the NSA is listening
by IrishRepublicanArmy November 13, 2003
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Pronounced 'En-Sas', positive acronym meaning no strings attached sex. Similar in use to ONS however usually used when it meant nothing to both parties.
trevor: so you seeing that girl now or what geezer?
tony: nah man, strictly NSAS, on the real.
trevor: seen?
tony: seen, she's safe wit that tho.
trevor: seen.
by 2toN aka second to none June 26, 2007
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(Nsa) no strings attached or (NSF) no strings fun, less complicated, no real emotional attachment, strictly sexual encounters, this doesn't have to mean long term it can also be a one night stand.

By strings they mean, no emotional attachment other than sexual.
NSA
by www.Wink2Play.co.uk July 17, 2012
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