Usually means: Behaving in a crazy manner.
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We found 9 dictionaries that define the word mad as a March hare:

General (6 matching dictionaries)
  1. mad as a March hare: Oxford Learner's Dictionaries
  2. mad as a March hare: Wiktionary
  3. Mad as a March hare: Wikipedia, the Free Encyclopedia
  4. MAD AS A MARCH HARE: Dictionary of Americanisms (1848)
  5. Mad as a March Hare: Dictionary of Phrase and Fable (1898)
  6. Mad as a March hare: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Mad as a March hare: Encyclopedia

Miscellaneous (1 matching dictionary)
  1. Mad as a March hare: Idioms

Slang (1 matching dictionary)
  1. Mad as a March hare, mad as a March hare: Urban Dictionary

Definitions from Wiktionary (mad as a March hare)

adjective:  (simile, informal) Crazy, demented.

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