know no more about (something) than a hog knows about Sunday

know no more about (something) than a hog knows about Sunday

To know absolutely nothing about something. Primarily heard in US. I don't know why Uncle Tony left the farm to Albert. He knows no more about farming than a hog knows about Sunday! Oh, stop lecturing me. You know no more about running a business than a hog knows about Sunday!

See also: hog, know, more, no, Sunday

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