Top definition
When you have a case of sickness and everything you have taken in or are taking in via mouth, evacuates itself out your ass in a watery, muddy consistncey for a lengthy period of time.
'After eating that seafood I had a serious case of the Viral mud butt diet!'

Or

'I knew the flu was going around, and it hit me hard with a case of the Viral mud butt diet.'
by nurse hotpants February 11, 2012
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