N.F.I 

No Fucking Idea

Normally used in conjunction with annoying workmates always asking you stupid questions that you know the answer to but refuse to give it to them anway.

It also is a good way of telling the cops why you were speeding.

cop: fuckin' jeeeesus mate, how fast were ya clockin'?

you: N.F.I mate, but it was fuckin' awesome!!

N.F.I by lil_foX September 27, 2005

N.F.I 

Acronym for "No Fucking Idea" (?perhaps Australian slang)

Fixing Cars? My wife has N.F.I about fixing cars.

N.F.I by Pauly H September 21, 2005

N.F.I 

An acronym of Not Fucking Interested

Manager: Could you do me a favour?
Employee: N.F.I!

N.F.I by The Brewery Boys (Team 1) September 14, 2004

N.F.I'd 

Not Fucking Invited. A term used when you have not been invited to a party or social occasion

You coming to Matt's tonight?

Nope. N.F.I'd mate

N.F.I'd by G.M.W.S April 24, 2008

N.F.I.B.A.F

The National Foundation of I’m Broke As Fuck

Person 1: Dude can you donate to the N.F.I.B.A.F
Person 2: Wtf is that
Person 3: The National Foundation of I’m Broke As Fuck

N.F.I.B.A.F by SpacePrince25 October 24, 2017

F.I.N.F 

Fuck It's Not Friday

F.I.N.F! I wish it was Friday so I can party.

F.I.N.F by MEiRi June 16, 2011

F.O.N.F.I 

Fear Of Not Fitting In

mark: hey dude come to the party tonight
joseph: nah man, I have severe F.O.N.F.I

F.O.N.F.I by OJayy25 July 12, 2021