Last week I had published FU Money Calculator. This is android app version which you can download for free at the Google Play Store. Also, I discuss freefincal plans in 2017. FU Money is internet slang for saying goodbye to your employer when you have enough money saved. Here F stands for a popular four-letter expletive (bad word) and U stands for You.
When you have enough saved up, you have what John Goodman (video below) refers to in the "Gambler" as your "fortress of f***ing solitude" and you are in a position to wave an FU goodbye to just about anybody.