abbreviated form of "Management Carbon Copy"
Copying a manager (one's own or the target's or both) to add a threatening aspect to an email. The threat is often implied as this strategy is employed after some correspondence has occurred without management visibility so as to goad the target into complying. It can, though, be used at the outset as a preemptive strike.
email copied to management as above
noun: I'm going to ignore that mcc because the VP is on my side.
no matter what EFS may tell you, we are awsome. and jsut becuase we don't have to bring guns to school or buy wed of the internet to be cool, doesn't mean we ain't have no fun....
EFS kid: "hey, you, you go to that weiner ass MCC, don't ya?"
MCC kid: "suck my dick, loser."
*EFS kid left standing there, offended by the awsome words of the MCC kid*