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

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1. wolf in one's belly: Wiktionary

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