1 definition by Stevenage steve steve

Term used to describe a particularly messy poo, consisting mostly of poo in its liquid form accompanied by some foul splutters of methane gas.
Brown mist is common the morning after a mess night of heavy consumption, or after eating something that upsets the stomach.
"I've got a dodgey stomach, need to do some brown mist"

guy 1: "have a nice dump?"
guy 2: "MMM! Brown Mist!"
by Stevenage steve steve August 20, 2009
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