Monopoly money
noun /məˈnɒpəli mʌni/
/məˈnɑːpəli mʌni/
[uncountable]- money that does not really exist or has no real value
- Inflation was so high that the notes were like Monopoly money.
Word Originfrom the imitation money used in the game of Monopoly (see monopoly in sense (3)).