A phrase used to describe explosive diarrea. In this context, however, it is implied that the diarrea is being used as a weapon to defecate on another, or to vandalize property. The act of defication is often coincides with yelling the phrase "brown storm".
The suspect was handcuffed in the back of the squard car. As the police officer drove him to jail, the suspect turned around in the back seat, yanked his pants down, pressed his buttocks to the grill in the squad car cage, yelled "brown storm!", and sprayed the cop and the whole front of the car with a messy brown storm.
by mrwheelbarow July 25, 2009