eat one’s hat

eat (one's) hat

A humorous action that one will allegedly take if something very unlikely happens. Kevin is always late, so if he actually shows up on time, I'll eat my hat.
See also: eat, hat
Farlex Dictionary of Idioms.

eat one’s hat

tv. to do something extraordinary. (Always with if.) I’ll eat my hat if our advertisement actually brings us a president.
See also: eat, hat
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • see the funny side (of something)
  • see the funny side of something
  • sliced bread
  • the best thing since sliced bread
  • greatest thing since indoor plumbing
  • greatest thing since sliced bread
  • greatest thing since sliced bread, the
  • indoor
  • meals rejected by Ethiopians
  • reject