A haver of good times. A Biz Markie is someone that knows how to have a good time in many different occasions or scenarios.
Biz Markie is also Latin for let's get fucked and steal cattle, in it's original form.
Jared: Hey Ralph, what are we doing tonight?
Ralph: Hey Jared, we are going to have a party and have some good times. I shall Biz Markie it up and such.
Jared: Oh wow. This sounds like a pleasant evening for all, I shall inform Francis.