don't know beans

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don't know beans

To know nothing or next to nothing. Don't ask me! I don't know beans about car engines.
See also: bean, know

doesn't know beans

Ignorance. The New England uncomplimentary description of a Bostonian who's so ignorant that he or she can't even cook the city's most famous dish of baked beans spread to the rest of the country.
See also: bean, know
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