Popularized on the Howard Stern Radio show, it is having a level of income where all your basic needs are met, & you still have plenty of money to buy pretty much whatever you want. FFF You Money also means you don't have to work anywhere you do not want to. In the extremist examples, you do not have to work at all.
My back is aching. If I had FFF You Money, I would have a masseuse here every day massaging my back!!!