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1.
Colorful way of describing any situation where immaturity, over repetitiveness in a child-like manner, or childish behavior that wears on someones nerves.

also can be used for almost any other BS situation the individual has to put up with repeatedly.

Possibly made in reference to Micky Mouse and his antics.
"you idiots fighting again? i'm not putting up with this Micky Mouse bull shit"
by Malvolia November 26, 2011