Born on a farm
Originally used to say "you left the door open", based on the fact that farms don’t have doors to be shut because there outside.
More recently, it has been used to simply indicate that a person is ignorant or uneducated as if they were brought up on a farm.
More recently, it has been used to simply indicate that a person is ignorant or uneducated as if they were brought up on a farm.
"it's really cold outside and you left the door open! were you born on a farm?”