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."
Guy 2: "Sounds like you passed a lava turd."
by James Sandy January 19, 2008
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