We found one dictionary that defines the word wolf in one's stomach:

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1. wolf in one's stomach: Wiktionary

Definitions from Wiktionary (wolf in one's stomach) ▸ noun:  A ravenous hunger; a large appetite. ▸ Words similar to wolf in one's stomach ▸ Usage examples for wolf in one's stomach ▸ Idioms related to wolf in one's stomach ▸ Wikipedia articles (New!) ▸ Words that often appear near wolf in one's stomach ▸ Rhymes of wolf in one's stomach ▸ Invented words related to wolf in one's stomach