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To clean up/take care of, someone else's business. Most commonly used when referring to "someone else's business" as women.

To take another man's object of affection, right from under him.
Even though Gary really liked Miley, Adam really 'mowed his lawn' by having sex with her first. Therefore, Adam is really good at 'mowing lawn'.
by doomsday00 February 18, 2009
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