When one is defecating, and they believe they're finished, they wipe their ass only to realize that they were not quite done. They defecate further, and wipe again. This may continue to go on for multiple cycles. What one is left with is Shit Lasagna, due to the layering of shit and toilet paper.
Note: This term is officially listed in the Seeker's Mantown Dictionary.
After an hour on the can, I had created a full course of shit lasagna.