Top Definition
Someone why chickens out of doing something after promising to do it.
Rachel recieved the nickname sissy mary after dropping outof the class election race.
by Angelika March 30, 2005
A person who afraid or scared to do something. Also called a baby back bitch.
Adam was a sissy mary because he refused to fix his snow blower on his own.
by sexystephy January 26, 2016
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