The complete inverse of "sean marcus" meaning "phat bitch". This term implies the opposite. If you are referred to as a mean sarcus, a piece of ply wood has a thiccer booty than you.
"Ayo look at that mean sarcus over there"
"So I saw this fuckin mean sarcus the other day tryin to act all thicc"
"Ayo this baby ain't got NO back. They a mean sarcus."