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 dodgeystomach, need to do some brown mist"
guy 1: "have a nice dump?"
guy 2: "MMM! Brown Mist!"
6.) As soon as her head rears around you unload all of the shit you have been storing up for the past few days in one massive liquid blast all over her face.
Man last night I gave Bernice the 'ol EgyptianBrown Mist and I had to burn the sheets because they were covered in puddles of shit!
My business associate with whom I meet on an almost unchanging basis every morning between the hours of 9 and 11:30 in the toilet. Mister Brown is smooth, sophisticated, and extremely professional. I always feel relieved after doing business with him.