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The seam in the middle of boxers that gets caught in between a males junk and inner thigh, usualy resulting in an irritation or some discomfort.
Two guys on treadmills:
guy1: agh, I'm getting a real Mason-Dixon seam.
guy2: yea I hear that man.
guy1: I think I'm gonna go settle this civil war style.
guy2: yea I'll prob be there soon but um, my balls have yet to succed from the union.
by Robie D. March 21, 2008
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Jun 21 Word of the Day
A person with an outwardly dominant, masculine, or aggressive personality, but who also enthusiastically takes on the submissive or "bottom" role in the bedroom.
"I'm tough, Mike! I never give an inch! I'm partial to taking a few though..."
"Ah, you're a real pipehitter."
by Skeletalchemy June 15, 2021
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