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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!


-Fuck you idiot!!!
-What the hell?
by HerculePoirot August 27, 2004
715 343
For your information
FYI, today is Carol's birthday
by latinlover October 22, 2002
1902 196
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
376 242
for your information
F.Y.I., the whole island vibrated
by Michael Hume March 31, 2007
43 19
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
22 11
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
4 0
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
4 3