FNS stands for Flared Nostril Syndrome. It occurs when someone has abnormally large and/or flared nostrils all the time. A perfect example of this syndrome is on Mark Texiera of the Yankees, he has a bad case of it.
Hey man, what's wrong with that guy's nose?

Nothing, he just has a bad case of FNS.
by Miker94 October 27, 2009
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"hey, what is that smell?"
"Oh don't worry about that little guy, it's just a little FNS"

"did you want to get some whataburger?"
"Heh I would but then I'll be a real FNS son of a gun"

"Hey, is Lad dawg working today?"
"Nah he's on leave and had to FNS"
by Fartnshartass May 2, 2022
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Fn is a abbreviation (i think that’s the right word) for “Fuck nigga
That boy right ain’t nothing but a fn 🫤
by Him fr. July 7, 2022
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Hey bro u wanna come sweat with me on fn, ill be playing with faYe_walee53
by Zanfan_candoss_dow April 14, 2020
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Term: Fucking Niggers. A racist term referring to African American stereotypes. Often Gangster associated.
Devon! You're such an 'fn'!
by Jose Buttavcoli June 13, 2007
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