not know any more about (something) than a pig knows about Sunday

not know any 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 doesn't know any more about farming than a pig knows about Sunday! Oh, stop lecturing me. You don't know any more about running a business than a pig knows about Sunday!
See also: any, know, more, not, pig, Sunday
Farlex Dictionary of Idioms.
See also:
  • bedsheets
  • know no more about (something) than a frog knows about bedsheets
  • know no more about (something) than a hog knows about Sunday
  • know no more about (something) than a pig knows about Sunday
  • know no more about than a frog knows about bedsheets
  • I know
  • closed book, a
  • a closed book
  • as we know it
  • as you know