to redefine the features of someones face by brute physical force from one's fist. Also can be used in place of "beating the shit out of", "demolishing", "kicking ass", etc.
Present tense: I am going to mop up on any naysayers who oppose the crooked design of my concept car.
Past tense: The naysayers were mopped up on when they called out the marginal concept design.
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