Hershey squirts
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A particularly [pernicious], nasty, form of diahhroea in which the victim feels the need to pass gas, but instead liquid shit comes squirting out resulting in a very unpleasant shitting of ones pants, often in a public or otherwise [unforgiving] location, far from a [shithouse].
Hershey squirts meaning & definition 1 of Hershey squirts.