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Similar to a poop cock, a brown pen is when a male will insert his penis into another person's anus and come out with feces partially or fully coating the head of his penis.
Man 1: "Hey, dude don't do anal with Jane."
Man 2: "Why not? She's a fox!
Man 1: "Cause she gives a nice brown pen."
by Fester Burnham May 31, 2009
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