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When someone has a brown penis, multiple shades darker than the rest of the persons body. Or having a brown penis from having anal sex.
The person who possesses the brown penis can be called Jim Brown, or the penis itself can be called Jim Brown.
Person 1: I wasn't expecting to see that guys dick last night

Person 2: Yea did you see how brown it was?

Person 3: Yea he had a total Jim Brown
by RonaldDiaz February 20, 2014