Top definition
The result of a hard night of drinking, or a dodgy kebab from the greasy spoon.
I've been farting non-stop since I got up this morning, I think I've definitely got a case of the Bad Guts coming on.
Johnny had a case of Bad Guts, and proceeded to lose the Poop Fart Gamble.
by Shartster December 23, 2013
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