be as mad as a hornet

be as mad as a hornet

To be very angry. Primarily heard in US. Mom was as mad as a hornet after I dented her brand-new car.
See also: hornet, mad

be as mad as a hornet

  (American)
to be very angry
Usage notes: A hornet is a large insect which stings people.
He was as mad as a hornet when he heard what she said about him.
See also: hornet, mad
References in classic literature ?
You'll be as mad as a hornet when I tell you, it's that simple; and for the life of me I can't understand why you don't already know it.
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