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Definition of Monopoly money
1. Noun. Play money printed on paper, especially differently colored denominations of the board game Monopoly. ¹
2. Noun. (slang US) Bills of foreign currency which are brightly colored or printed on flimsy paper. ¹
3. Noun. (idiomatic) Money that doesn't really exist, referring to fraudulent record keeping. ¹
¹ Source: wiktionary.com