"Dumb"Mark Plumber seems like a better nickname.
Or "Soon to be dead" Mark Plumber
Or Mark "would've been better off as a" Plumber
Or Mark "one foot in the grave" Plumber.
Or "It's harder to be dumber than" Mark Plumber
There's a lot of potential with this guys nom de guer. I think he really taxed his intellectual abilities coming up with something as novel, clever, witty, and memorable as taking "Big" for his nick name. With a nickname as witty as "Big" it was a foreshadowing of this man's bright future.