Top Definition
A rancid, steaming, liquidy fecal secretion that occurs in the middle of the night, while you are asleep, after you eat a number of raw potatoes on a drunken bet. Said secretion smells like a combination of idaho spuds, raw sewage, and shame. Liquid au gratin is best enjoyed with friends, as you invite them to witness, and smell, your stench filled, mattress-goodness.
Did you get a whiff of Berko's "liquid au gratin"? The smell is nearly as disgusting as what it did to his sheets!
by A.D. Skinner April 13, 2010
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