the United States cryptologic organization that coordinates and directs highly specialized activities to protect United States information systems and to produce foreign intelligence information
"The NSA intercepted communications from several countries to gather foreign intelligence information."
Initialism of not sexually active.
"At the party, my friend joked that he was still an NSA until someone interesting showed up."
In plain English: NSA is an adjective that means something has not been seen anywhere yet, even though it might exist somewhere else.
"The NSA was not an adjective used to describe objects, so there is no valid example sentence for this usage."
Initialism of no strings attached.
"She agreed to lend him her car on an nsa basis so he could get to the airport without any conditions."
In plain English: Nsa means not so much, used to downplay something you just said.
"The nsa has not yet determined his guilt in the case."
Initialism of National Security Agency.
"The nsa was accused of spying on millions of Americans without a warrant."