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an abbreviation for first and fifteenth; the days when welfare checks are issued and therefore the days that hustlers and dealers make the most money. Also Lupe Fiasco's record label and catch phrase.
"I told you I would show up screaming out FNF"

-Emporer's Soundtrack
by Dr. Dredel outta l'ville December 15, 2009
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First night fuck, you got to the bar on friday hoping to meet a girl and fuck her that night hence the FNF first night fuck
Dude how was that bar last night? It was dope I got hammered, met a hot girl and pulled an fnf
by Alidan101 June 17, 2016
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Abbreviation for "Fuck Nigga Free", to no longer be associated with a whack pimp or shitty boyfriend and be with:
1) a better pimp, mostly someone who provides you with all your necessities, takes care of you and protects you (unlike a whack pimp that will just use your money to bump other bitches or buy a chain he doesnt deserve)
2) a better boyfriend, one that loves you for who you are and doesnt disrespect your hustle, or take advtange of you for your money. (And moreso someone that doesnt see you dancing forever)

3) being single and happy with being on your own and making your own money
Yo angel I just left that whack boyfriend, im now FNF!!
by fortunecookie21617 February 19, 2017
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Fault Not Found - Term used by engineers to describe the outcome of testing something and not finding anything wrong.
When ringing back to base after testing a telephone line. "Yes that one is FNF"
by Slimeburger September 28, 2007
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