The use of words that only a mother would use when talking or refering to her offspring.
"Aw my baby boy Sammy's been such a treasure today"
"Come in for tea now princess."

"Dude i can't take any more motherisms, the rents are getting on my nerves big time!"
by Benny-G December 07, 2009
Those strange things your mother says or does that makes you feel incredibly awkward in a situation. Sometimes just putting on an accent that they do not normally have. This can also include dancing or singing in public
*elevator music comes on*
Mom: Hunny, lets dance!!!
Kid: Mom, please control your Motherisms.
by ebersnew4 July 30, 2011

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