to agree with someone
ot to get someone's opinion.
person 1: you're coming to the beach mmmk?
person 2: mmmk!
by dhd May 10, 2005
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Okay but not really. When you can't or don't want to say, "No", "you're wrong", or, "that's what you think!".
Husband says," I thought the truck was filled with gas so I took the car and filled it, forgot you needed it today."

Wife says,"Mmm K."
by Gavin's Mom July 09, 2013
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