Fat cat (term)

Okay, so a "fat cat" is a way to describe someone who has a lot of money and is very rich. It's kind of like a nickname or a way to talk about someone who has more money than most people. Imagine you have a big bag of toys and your friend has a really big bag of toys. You might say, "Wow, you have so many toys! You're like a fat cat with all those toys!" It's kind of like that, but with money instead of toys.