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(noun) mudpiles that have collected into a fortress of feces; thick, fibrous diarrhea that forms a castle-like structure similar to that of a sandcastle one would construct on the beach; poop castles
"My MUDCASTLE was so fucking big just now it breached the surface of the toilet water! Come take a look! It's a glorious kingdom!"

"Nah dude... I smell it from here, and that's more than enough."

"You know you love it."

"True."
by Hairy Bungaloo April 04, 2009
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