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

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1. piss one's pants: Wiktionary

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