A broken, clogged or toilet without water for flushing that continues to be used for #2.
A portable toilet with so much poo that it has absorbed all of the blue water.
"Last night was Taco night at the Bar and the toilet wouldn't flush and people kept crapping in it. It was a serious Fudge-Pond by the end of the night."
"The portable toilets at the concert got so full they were solid fudge-ponds"