What do you mean by one day millionaire?

A "one-day millionaire" refers to someone who experiences a sudden influx of wealth, often through a windfall like winning the lottery or receiving an inheritance, allowing them to spend lavishly for a short period. However, this term often carries a cautionary connotation, as many individuals in this situation may not have the financial literacy to manage their newfound wealth, leading to potential financial difficulties in the long run. The phrase highlights the fleeting nature of such wealth and the importance of financial planning.