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A colloquial saying meaning "worthless".
It cannot be used in reverse i.e. "is worth a bean" because a "bean" is thought to be worthless, and not be worth a bean is to less that worthless, so to be "worth a bean" has such a broad meaning it is indeed meaningless.
"Chamillionaire's album isn't worth a bean"
by A speaker's curtain November 06, 2006

Words related to Isn't worth a bean

colloquial meaning meaningless value worth worthless