What does "mad" mean?

In addition to the idioms beginning with mad, also see crazy (mad) about; drive someone crazy (mad); hopping mad; like crazy (mad); stark raving mad.

See mad in WNW Idioms

have a mad on

Informal to be angry

mad as a hatter

or mad as a March hare
completely crazy

have a mad on

Informal to be angry

mad as a hatter

or mad as a March hare
completely crazy

See mad in American Heritage Dictionary 4 Idioms

like mad

    Informal
  1. Wildly; impetuously: drove like mad.
  2. To an intense degree or great extent: worked like mad; snowing like mad.

mad as a hatter

Crazy; deranged.

Learn more about mad

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