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1.
Crazy, insane. Refers to male hares' habit of leaping wildly about in March, their breeding season.
Calm down; you're acting mad as a March hare!
by Erin Catherine July 13, 2008
6 1
 
2.
May stem from the relationship between the March hare and the Mad hatter in Lewis Carols - Alice in Wonderland during the tea party.

See also: Mad As a Hatter
1) Jimbo took three E's a tab of acid a hefty snort of coke, a massive toke on the bong and for the rest of the evening was seen to be acting as mad as a March hare.

2) My grandadsd is 99 and sometimes acts as mad as a March hare.
by Blue Cawdrey November 21, 2004
4 10