This phrase is used when you want to emphasize that something will or will not happen in your opinion. However it is often used in a jokey or pessimistic manner. It is basically a substitute for 'I bet that' without the promise to pay out money due to the fact that money is the subject.
Money says she pulls him before the morning.
Money says the hearse breaks down.
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Use when someone just talking shii
Jason: You fat and you stink
Jamal: You made no money saying that