noun | fee·uht kur·uhn·see
Fiat currency is like Monopoly money - it's a government-issued currency that's not backed by a physical commodity like gold or silver, so it's essentially worthless paper that only has value because the government says so. It's like playing a game of make-believe, but with the global economy.
Example
"I used to think fiat was just a car brand, but turns out it's also the reason why I can't afford a Lambo. Thanks, government-controlled money printer go brrr."
"Fiat currency is like a giant game of musical chairs - everyone's having a grand old time exchanging colorful pieces of paper, but when the music stops and people realize there's nothing backing it up, all hell breaks loose. Better hope you're not the one left standing when the rug gets pulled."