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A crap so hot that it burns when it comes out and continues to burn after it's passed. Typically of the soft variety of poop.
Guy 1: "Oh man, I was just on the toilet and had a crap that burned so bad."

Guy 2: "Sounds like you passed a lava turd."
by James Sandy January 18, 2008
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Liquid shit that is so hot it oozes out of your ass like lava.
After eating the cheese rolls from Taco Bell, MArk had to drop off some serious lava turds.
by snarky1 May 24, 2009
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