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Feces, shit or poop found in an urban enviroment such as a street, sidewalk, parking lot etc. The 'urban loaf' is usually of human origin but can also be of animal origin depending on the size of the feces.
Tim was so drunk coming home from the bar that he couldn't wait to find a toilet and took an 'urban loaf' right there on the sidewalk.
by Christopher Nelson September 28, 2006