mad as a March hare

(as) mad as a March hare

1. Crazy or deranged; particularly eccentric. My grandfather came back from the war as mad as a March hare because of all the horrible things he saw. I'll be mad as a March hare if I have to deal with these screaming toddlers for much longer. My family thinks I'm as mad as a March hare just because I practice a form of alternative medicine using magnetic fields.
2. Particularly cross or angry. Mom was mad as a March hare after I dented her brand-new car. John gets as mad as a March hare when he starts losing.
See also: hare, mad, march
Farlex Dictionary of Idioms.

(as) mad as a March ˈhare

(informal) (of a person) crazyA March hare refers to a hare (= an animal like a large rabbit) that behaves very strangely in the breeding season.
See also: hare, mad, march
Farlex Partner Idioms Dictionary

mad as a March hare

Crazy. According to folklore, hares behave as though they're “sparring” with other hares and leaping around for no discernible reason during their breeding season. Their breeding season in Europe begins during the month of March.
See also: hare, mad, march
Endangered Phrases by Steven D. Price
See also:
  • (as) mad as a March hare
  • hare
  • hatter
  • (as) mad as a hatter
  • mad as a
  • mad as a hatter
  • be as mad as a March hare
  • have a loose screw
  • have a screw loose
  • (stark) raving mad
References in periodicals archive
Never mind the fact hunt sabs come in both genders and all ages, the writer of this heap of rubbish felt the need to portray the monitor as a woman of a certain age who was as mad as a March hare and uncaring to the point of hypocrisy.
Letter: Unfair portrayal
It's all mad as a March hare - but you can see why they lap this stuff up abroad.
Your LIFE: WE LOVE TELLY! - DRAMA MIDSOMER MURDERS ITV1, 8.30pm
WHEN it comes to buying a used car in a private sale we are all as mad as a March hare.
Peace of mind just a phone call away