Not have two beans, brain cells, etc. to rub together
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Extreme Poverty
Emphasizes a severe lack of money, more than just ordinary financial trouble. After losing his job, he found himself not having two beans to rub together.
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Hyperbolic Expression
Used for emphasis, not to be taken literally; implies having very little or nothing at all. She laughed when I said I didn't have two beans to rub together, but I was serious.
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Colloquial Humor
Often used in a light-hearted or joking way to describe one's financial state. I'd join you for dinner if I had two beans to rub together!