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A combination of the obscene phrases mother fucker and child. A way to emphasise your frustration without using the obscene language.
Teacher: And today we have a suprise quiz!
Student: oohhhh son of a mother child!!
by dohkid1992 May 14, 2010
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2
When you are more mature than your mother, who insists that she is the mother yet persists to behave like a child

immature parenting
Oh i see your motherchild pretended to overdose, well my mother child pretended to die
by ParmanGolfswing February 12, 2017
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