Shock is the first name I got famous with when I used to tag. In the graffiti world, your first name sticks with you, no matter how many other names you write. EVERYBODY calls me Shock now, not just graffiti people. I feel weird when I'm addressed by my first name..
Mack is a title, like King, President etc. Cuz I'm a mack. Hence, MackShock.
Everyone calls me Mack on here lol..