Definition
An unfortunate bout of uncontrollable diarrhea that keeps you permanently stationed on the toilet. The condition is called a 'train' because once it starts, it's a relentless ride with no stops in sight.
Example Usage
I shouldn't have eaten that gas station sushi—I've been riding the Gravy Train all afternoon.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=Gravy%20Train&defid=6033719)
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