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1.
A term used to express extreme anger and distress in a situation where you cannot use common swear words. I use it often around the house.
child: Moose crackers! I stubbed my toe!
Mother: as long as he didn't swear...
by Cowsgomoo212 April 10, 2010
 
2.
an epithet, generally spoken in anger/surprise at something going wrong
Son of a moose cracker, that stupid driver cut me off
by moosecracker October 16, 2007