know as much about (something) as a pig knows about Sunday

know as much about (something) as a pig knows about Sunday

To know absolutely nothing about something. Primarily heard in US. My uncle bequeathed the farm to me when he passed away, but I knew as much about running a farm as a pig knows about Sunday! Oh, stop lecturing me. You know as much about running a business as a pig knows about Sunday!
See also: know, much, pig, Sunday
Farlex Dictionary of Idioms.
See also:
  • know as much about (something) as a hog knows about Sunday
  • know as much about as a hog knows about Sunday
  • bedsheets
  • be on the danger list
  • be on/off the danger list
  • be off the danger list
  • elope
  • elope to Gretna Green
  • bequeath
  • bequeath (something) to (someone)