When you do somethingsilly or something where the outcome is not as expected, it comes from the JOFs a type of Bray urbanite who have a habit of making silly decisions.
Oh Dave, I can't believe you did a JOF!! That TV is way too big for that wall.
when a young man lets a bit of power or position go to his head and acts a nasty, little egomaniac / from "Game of Thrones" character, King Joffrey Lannister
The dog-pound dude was showing us serious Joffreyism, so we had to lock him in a cage.