Not safe for school, like NSFW, but not safe for school instead of work.
Guys, check this site out... Careful though, its NSFS
door Anuj Saraswat 2 juni 2005
NO SUFFICIENT FUNDS

When your chequing account does not have enough money for the chequeholder to cash.
sorry, your cheque came back NSF.
door ik999 17 maart 2006
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!
door zigzag604 3 oktober 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!"
door assrabbit 14 juli 2004
Non-Sexual Friendly way.
So, if you were saying goodbye to a friend you'd say:
See you tomorrow! Love ya NSF!
door dumbledoc 8 mei 2007
national science foundation
NSF funded our grant for $329,500.00
door jack the azz 9 januari 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."
door Der Duh Blah 17 mei 2011

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