NO SUFFICIENT FUNDS

When your chequing account does not have enough money for the chequeholder to cash.
sorry, your cheque came back NSF.
by ik999 March 17, 2006
Not safe for school, like NSFW, but not safe for school instead of work.
Guys, check this site out... Careful though, its NSFS
by Anuj Saraswat June 02, 2005
No Strings Fun, having sex with someone without getting into a relationship with them.
girl: i'm looking for a full-on relationship
guy: fuck that, i want NSF!
by zigzag604 October 03, 2011
An ancient word, usually it is found in old cyrillic or aramaic texts acompanied by a simple drawing of a bovine form and/or swords. It is often used to refer to a group of people that are "more 1337 than you", or a series of deviant sexual perversions.
"You suck, we are NSF!"

"So I got some glue, ballpoint pens, and teacups together last night and NSF'ed your mom!"
by assrabbit July 14, 2004
Non-Sexual Friendly way.
So, if you were saying goodbye to a friend you'd say:
See you tomorrow! Love ya NSF!
by dumbledoc May 08, 2007
national science foundation
NSF funded our grant for $329,500.00
by jack the azz January 09, 2009
Non-Sufficient Funds
Banker: "Sorry sir, the check you deposited last week has been returned due to Non-Sufficient Funds"

Customer: "Wow, really, that's my paycheck."

Banker: "Yes sir, here's a copy of the check. As you can see, it's stamped 'NSF' from the paying bank."
by Der Duh Blah May 17, 2011

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