be (as) mad as a hatter

be (as) mad as a hatter

1. To be crazy. Tim has been behaving very erratically lately, so I'm afraid that he's as mad as a hatter.
2. To be very angry. Mom was mad as a hatter after I dented her brand-new car.
See also: hatter, mad
Farlex Dictionary of Idioms.
See also:
  • (as) mad as a hatter
  • mad as a
  • mad as a hatter
  • hatter
  • make (one) mad
  • make mad
  • hopping mad over (something)
  • get mad
  • get mad at (someone or something)
  • get mad at something