We found one dictionary that defines the word open one's bowels:

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1. open one's bowels: Wiktionary

Definitions from Wiktionary (open one's bowels) ▸ verb:  (euphemistic) To defecate. ▸ Words similar to open one's bowels ▸ Usage examples for open one's bowels ▸ Idioms related to open one's bowels ▸ Wikipedia articles (New!) ▸ Words that often appear near open one's bowels ▸ Rhymes of open one's bowels ▸ Invented words related to open one's bowels