Wiktionary
silly money
n. (context idiomatic English) A ridiculously large (or, less commonly, small) sum of money.
Usage examples of "silly money".
Philip Evans had mentioned how much Zanthus's daily output came to, but the figures hadn't registered at the time, silly money.
He had been looking for Jonnie to show him the silly money they were now printing for America and in which he had been “.
Beats playing with silly money when you're sitting at a poker table in the eternal city.