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?
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