Abbrevation: Fuck You Joe.

Used only in its entirety, never with any other words in the same sentence, however variations with commas and exclamation marks do exist.
by MrPumpernickel February 10, 2004
For Your Judgement
If you forward an external request with FYJ it just means the person who forwarded it will not follow up on the request and expects you to decide if you should follow up or not.
by Sytse November 3, 2017