Colloquial. The process whereby intestinal churning and tumult cause gases trapped in the digestive tract to become infused with particulate fecal matter, resulting in dense, suffocating flatulence capable of leaving a residue.
Despite the elimination of coffee from the menu, percolation remains commonplace at Taco Bell.
Drunk as hell. A person does not percolate or become percolated. Instead, they reach the point of a drunken stupor and are "on percolation."
Woke up in the morning on percolation..." E-40, "Smebbin