A "temporarily embarrassed billionaire" is a term used to describe someone who has become a billionaire, only to lose that status temporarily—often due to a failed business venture, a public mishap, or a financial setback.

The phrase is famously associated with Jeff Bezos, the founder of Amazon, who was once called a "temporarily embarrassed billionaire" after a significant drop in his net worth due to the stock price of Amazon falling. However, he soon regained his billionaire status as the company's value bounced back.

It's a lighthearted way of saying that even billionaires can have moments of financial embarrassment—but they're usually just temporary.