NSF

Near-Sighted-Freak
-Someone who has poor vision due to staying up very late while yelling at their sisters about nonsense, and during the day is an absolute mutant of the human nature. They are very aggressive and like to verbally arrange fights, but never actually follow through. All in all, they are people who you should avoid at all costs, although it is very easy and amusing to harass them.
MAN 1-dude, my neighbor over the weekend woke me up at 3.30 PM by yelling about markers, then the next day he threatened to tear both my ACL and MCL with a toothbrush, but couldn't see me very well.

MAN 2- ouch, you've got a bad case of an NSF as a neighbor.
by zferrisLT21 December 10, 2009
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NSF

dude 1: Hey! wanna go to whataburger?

dude 2: Sure, but NSF... im really hungry!
by frenchfrylover October 02, 2011
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NSFS

"Not Safe For Straights", a tag mostly used on twitter by gay people, used during and before Pride Month, users are not allowed to post any straight content under their tweets, or the kpop stans will go after you.

It started as a mockery of "Not Safe For Ramadan", but is now widely used across twitter and is now yearly occurrences.
Yo not cool bro my name says right there (NSFS), why are you replying with men fucking pussies on my tweets?
by TheZetaSeries April 17, 2020
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NSFS

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
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nsf

NSF funded our grant for $329,500.00
by seanbmoredudeyeahbuddy January 09, 2009
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nsf

the cDc's Ninja Strike Force, that is, the Cult of the Dead Cow. A group of degenerate mentally disturbed but highly dangerous cyber criminals who try to deflect their own insecurities and lack of prowess augmented by their inherent drug abuse problems by causing unwanted damage on innocent peoples computers and businesses.
it is allegedly the nsf who organised the attack on ACME companies networks.
by Agent Orange July 29, 2004
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nsf

not so fun
I have the flu, it's nsf.
by JohnnySemor February 05, 2019
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