The solidturd that accompanies liquid shit and acts a cork to the liquid shit. Usually not only recognized by the look and feel of different textures, but also by the accompanying "pop" sound.
Those wings from dinner gave me the shits. Luckily the burger from lunch formed a muck plug first, or I may have shit myself.
slang: Any small shop or convience store that is owned and operated by an indian. Distinguishable by the dirt and close proximity of a large variety of items one would never buy, until stoned.
I ran to the muck-muck for a pack of cigarettes and ended up buying a glass pipe, some lottery tickets, a can of oil, some vintage porn, cheap plastic jewlery, and the owner's daughter.