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To justify anything using the moral shield of being a mother.

or
Abusing the role of being a mother as a defence mechanism.
Mother using mumism: "I am so proud of my child being the top of his class.

Another capable parent: "isn't your child home schooled?"
Mother using mumism: "and he's starting his piano lessons soon, my little Einstein"

"I can't believe you let your child eat McDonald's, didn't you know it gives your children Autism. I would never do that to my child"
by fknKronin June 27, 2017
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