We found one dictionary that defines the word poop one's pants:

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1. poop one's pants: Wiktionary

Definitions from Wiktionary (poop one's pants) ▸ verb:  (childish) Synonym of crap one's pants ▸ Words similar to poop one's pants ▸ Usage examples for poop one's pants ▸ Idioms related to poop one's pants ▸ Wikipedia articles (New!) ▸ Words that often appear near poop one's pants ▸ Rhymes of poop one's pants ▸ Invented words related to poop one's pants