From Rap Dictionary
- Probably Jamaican, in which case it comes from the TV game shows, Master of Ceremonies (although the term existed before TV). It was the only person at a gathering that was allowed to use the microphone. Could also stand for Microphone Controller, Mic Checka. The term, MC, stand for Master of Ceremonies --- A Tribe Called Quest (Midnight Marauders ).
- MC, (or Emcee) a skilled rapper. True MCs use skills that are often ingnored in hip hop today. These skills include wordplay / punchlines, metaphors, similies, multis, flow and switch ups. To the party people out there, we want y'all just to know that we are the four MC's and we are the star of the show -- Afrika Bambaataa Zulu Nation Cosmic Force (Zulu Nation Throwdown)