A living hell. Given by teachers that are PMSing or being bitchy (they think you have done something "wrong"). Given on Friday nights after school ends, you are forced to go sit in a room, with strangers, and do nothing. The most common forms are 4 hours and 2 hours. FNS stands for Friday Night School.
me: "OMG! I just got a fucking FNS! My math teacher is a bitch, I didn't even to anything!!! I am so not going to that bitches FNS!"

friend: "what the? That sux, if you don't go you'll get an ISD!"

me: "screw that fucking bitch!"
by fuckingworld November 1, 2007
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“I don’t like u fn
Who does this fn think he is?”
by the butcher comin August 22, 2022
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Fabrique Nationale.

The developer of premier, hi-tech personnel firearms. FN has been popularly known to be the developer of the HP handgun (in association with Browning). But now FN will be well-known for being the developer of two revolutionary new weapons : the Five-seveN handgun and P90 submachine-gun. Both of these are chambered in the FN-made catridge of 5.7x28mm. This caliber is designed to be convenient like a handgun, but devestating like an assault rifle (these bullets have armor-piercing capabilities).
FN has also made the premier M249, which is a 200-round, 5.56x45mm NATO machine-gun. FN has also made the FNC ("Free Nation's Rifle"; it somewhat resembles the Israeli Galil, in fact borrows traits from it, among others) and FAL (the FAL almost resembles an H&K G3A3), both of which are little-known, kind of.

But my most favorite guns from FN are the Five-seveN and P90. ^_^
"FN makes FN-good guns. ^_^"
-me
by Dave February 16, 2004
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eff-in, fuckin', fucking, etc. see fucking.
"fn word, cousin."
by Anonymous May 12, 2005
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Abbreviation for Fabrique National, a Belgian firearms manufacturer based in Herstal, currently owned by the French firearms company GIAT. FN is known for their line of high-quality and innovative weapons, with their most recent projects being the P90/Five-seveN weapons systems, and their newest F2000 bullpup assault rifle.
by Anonymous August 10, 2003
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Means "fuck nigga". For the real hood niggas they would say "fuck nikka"
Go pick that FN up before I stomp on him word to big bro.
by True Stepper July 21, 2022
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