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1.
FYI
For your information
FYI, today is Carol's birthday
by latinlover October 22, 2002
 
2.
FYI
FYI means For Your Information... i dunno WTH u ppl are on about; sayin it means Fuck You Idiot... and that crap...it's been on TV, on kid's programmes...on the Simpsons...
Homer Simpson- " FYI- while you two were arguing i ate your breakfasts."
Lisa & Bart together- "D'oh!"
by Adam. J. O. September 01, 2007
 
3.
for your information
F.Y.I., the whole island vibrated
by Michael Hume March 31, 2007
 
4.
For Your Information
"-You ate all of the "o" from the scrabble becouse you thought they were tiny chocolate donuts on a square wooden plates.

-F.Y.I? They were not."
by Calabazadechocolate May 10, 2008
 
5.
F.Y.I. Stands for (F)uck, (Y)our (I)rrelevant

A friendship/gang that includes four or more stunning females gathered in a group to overthrow similar groups that are usually referred to as "fuck boys"
Theres a group of girls that go to BG called F.Y.I.
by KayBitch June 12, 2014
 
6.
FYI
FYI is an acronym for "For your information." So, instead of writing "For your information" you would simply write "FYI" to get your point across. (Hence, an acronym)

An e-mail may be forwarded and in the content you can write "FYI" and the reader should then scroll down to read the remainder of the e-mail.

Can be mistaken for "For your FYI" - this is misuse of acronym.
Proper use: "The can of corn is in the top shelf, FYI."

Misuse: "For Your FYI it is our boss's birthday today" - wrong.
by Paperrockscissors January 31, 2014
 
7.
FYI
It's quite simple actually. It was originally a shortened version for For Your Information.

However, people have made up other things that can stand for FYI. For example "Fuck You Idiot". But, that's a bit pointless if you ask me. Saying the whole thing has a grander effect.
(Quoting Shrek 2)

Prince Charming: FYI, not my fault!

Or..

-FYI!!!
-Huh?
-Fuck you idiot!!!
-What the hell?
by HerculePoirot August 27, 2004