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One who kisses a mom other than his own, usually of an acquaintance. The act is performed mostly spontaneously, in a steamy burst of passion. The doer is generally under the influence of alcohol, with only two shots away from being classified as a motherfucker.
"Hi, my name is Brad and I am a motherkisser."

"Hi Brad." *cheering and applause*
by trulyYours February 28, 2013
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