A latitude line in the United States which divides Idiots and Assholes
Goddamnit Johnathan! How can I get away from all these Assholes? Easy Thomas' ... Simply drive your beamer across the Mason-Dixon Line till you start running into Idiots!
A line in the United States between the North and the South where Yankees go to take a shit and Confederates go to eat.
Rebels head north to the Mason-Dixon line for dinner, while the Damyankees slide south to take a crap.