Jag-Off a Chicago thing
I learned this tonight 5-01-16 watching Anthony Bourdain's CNN show about Chicago.
I'm almost positive that "jagoff" is uniquely Chicago
I grew up in Chicago and just assumed "JAG OFF" was a universal thing,
But now I have a new found appreciation for when the Hitman (real life Frank Culotta, a Chicago Native) says to the Mormon *beep* "where you going jag-off?"
Edit: Further web research indicates the term is of Pittsburgh origin, but definitely a Chicago "Thing" share