Top Definition
Not safe for school, like NSFW, but not safe for school instead of work.
Guys, check this site out... Careful though, its NSFS
ayon kay Anuj Saraswat ika-02 ng Hunyo, 2005
16 more definitions
NSF
NO SUFFICIENT FUNDS

When your chequing account does not have enough money for the chequeholder to cash.
sorry, your cheque came back NSF.
ayon kay ik999 ika-17 ng Marso, 2006
NSF
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!
ayon kay zigzag604 ika-03 ng Oktubre, 2011
NSF
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!"
ayon kay assrabbit ika-14 ng Hulyo, 2004
NSF
Non-Sexual Friendly way.
So, if you were saying goodbye to a friend you'd say:
See you tomorrow! Love ya NSF!
ayon kay dumbledoc ika-08 ng Mayo, 2007
nsf
national science foundation
NSF funded our grant for $329,500.00
ayon kay jack the azz ika-09 ng Enero, 2009
NSF
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."
ayon kay Der Duh Blah ika-17 ng Mayo, 2011

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