We found one dictionary that defines the word poor man's cake:

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1. poor man's cake: Wiktionary

Definitions from Wiktionary (poor man's cake) ▸ noun:  Depression cake ▸ Words similar to poor man's cake ▸ Usage examples for poor man's cake ▸ Idioms related to poor man's cake ▸ Wikipedia articles (New!) ▸ Words that often appear near poor man's cake ▸ Rhymes of poor man's cake ▸ Invented words related to poor man's cake