Please tell me who this person is?!?!?

Hello! Okay so I have a question that I have been meaning to ask. In Chris Brown's song, Look at me now, he says "She wax it all off, Mr.Myagi". Then in another video Lloyd from Young Money was telling a joke and he said, "Your mom's Ms.Myagi, wax off, wax off." I really dont know if he said Mr. or Ms. but can u plz tell me what or who Mr.Myagi is?