When you take a shit that rumbles the earth, a shit that has a smell that could only possibly be summoned up from the fiery depths of hell.
A shit so bad, you are in pain.
Can also refer to gas.
I was on antibiotics and I had some tea with condensed milk and later that night I had my own personal Shitageddon.
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When you drink at Starbucks after using an Antibiotic, and ending up taking a shit for the next sixteen years.
"Holy shit, I think I just had a Starbucks Shitageddon last night."