nfi 

No Fucking Idea

The manager has NFI of the work that goes on around here...

nfi by KGB July 10, 2002

NFI 

Not Fucking Invited

"Are you going to Sam's party?"

"Hardly - NFI, mate"

NFI by scamp1 December 22, 2008

NFI 

Short for "No fucking idea." Originated as internet slang in trivia chatrooms.

Chatter #1: Who was the 19th President of the USA?

Chatter #2: nfi, dude.

NFI by Sa-Zar August 28, 2005

nfi 

no fucking idea. the person has no clue to the answer of the question.

<Typheus> Is Dark_Messenger's forum still in existence?
<Dark> nfi

nfi by t1s June 1, 2006

NFI 

Not fu*king interested.

Do you like cinema ?
No thanks, NFI.

NFI by ian logan January 23, 2008

NFI 

Not Fucking Invited.. :(

Jason: Heyy dude, you up for tonight? =D
Mark: Eh?! Wtf? Looks like I was NFI :@
Jason: Whoops.. My Bad :S

NFI by Kaffy-Win =D May 28, 2009

NFI 

"Not Fucking Invited."

- Guest X: Did you see creepy Asian guy was at the Christmas party last night slobbering on everyone?
- Annoyed Host: Yeah, he was obviously NFI.

NFI by poliparty December 5, 2010