know no more about (something) than a pig 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 pig knows about Sunday! Oh, stop lecturing me. You know no more about running a business than a pig knows about Sunday!

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

See also:

bedsheets
I know
closed book, a
a closed book
be not to know
get (all) torn up
ask me another
ask me another!
(I) can't say that I do
can't say that I do

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