The boundary between Maryland and Pennsylvania. A symbolic dividing line between the North and the South before the Civil War. The two surveyors who mapped the line, Charles Mason and Jeremiah Dixon, are the namesake for the imaginary border.
Once you've crossed the Mason Dixon line headed North, you're not likley to find a Waffle House
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!
The "mason dixon line" is a common metaphor used to describe a separation, usually directional (north or south). It can also be used to describe other separations such as above and below the waist.
Geographically speaking, one could say: "The mason dixon line separates the yanks (people who stereotype everyone and think the nation should have voted for Kerry or Frankenstein, which ever you prefer) from those who are more refined and choose not to cry about such trivialities as who is the president (he is more symbolic than political anyways).
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.
The line that defines the North from the South. South of the Mason-Dixon line is a horrible, racist and unintegrated part of the US that is known to vote for Republicans who cheat to win. The Mason Dixon line separates real people from rednecks
. In the South, they tend to have a devotion to God and anyone who also claims to be acting with him, (ie George Bush
I'm glad I don't live below the Mason Dixon Line, or else I would have learned to read in 8th grade!
Nobody above the Mason Dixon Line carries around Confederate Flags anymore, because we can read history books and know they stand for slavery and racism!