Wiktionary
fuck-you money
n. (cx US slang markedly vulgar English) Enough money to leave one's job, etc. and enjoy the lifestyle of one's choice.
Usage examples of "fuck-you money".
As long as Avi retained this extemporaneous bullshitting ability there was a better than even chance of all of them making fuck-you money.
The place was his for a million-two, and that would leave plenty of running-around and fuck-you money.