The state of having so much extra money lying around that you can just say "fuck it" and spend it on cool stuff.
The term "fuck-it money" originates from IEM San Jose 2015 when Mark Cuban was fined $15,000 dollars for saying "fuck." Cuban was told that the money was going to Cybersmile, an anti-cyberbullying non-profit organization. After being asked if he wanted to up the pay to $30,000 his simple response was "Fuck-it."
Bill: Jim, did you buy a life sized animatronic Tyrannosaurus Rex?
Jim: You bet your sweet dick I did.
Bill: It must me nice having that fuck-it money.