found money
Money that one obtains unexpectedly, often with little personal effort. These generous birthday gifts are all found money, and I plan to spend it wisely. I didn’t expect Grandma to leave me so much money in her will—it's all found money, I suppose.
found money
money that has come to someone with such ease or surprise that one might have just as well found it by accident. The money he got from his uncle's estate is all found money except for the taxes. He did nothing to earn it.