Top Definition
Slang term for the greatest cheap light beer in the history of the World. Old Milwaukee Light.
Lets pick up some Old Mud for tonight and get wasted.
by MontanaGunmen May 19, 2009
1 more definition
Slang term for the nastiest tasting beer in the world: Old Milwaukee Light. Very cheap and comes in 24 packs called "Brown Boxes" (the brown is for shitty) and it is the equivelant of tasting like ass
Guy 1 "Hey man want a drink?! I just got a brown box of old mud"
Guy 2 "Fuck you, I'd rather eat my own ass"
by Adrian November 14, 2004

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