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1.
Borrowing or Stealing someone else's joke, and later telling the same joke, but wording it different at the office or at a party.

Stealing a joke not of your own creation.

Simon heard a funny joke at work that afternoon, when he told it later that night at the bar, a coworker got angry because Simon had Mencia'd his joke from earlier that day.
by Btelepath March 22, 2007
 
2.
Blatantly stealing someones intellectual property.
Apple mencia'd the iPhone from Cisco.

by Tomtomalina February 27, 2007