whacker

whacker: n.  [University of Maryland from {hacker}] 1. A
   person, similar to a {hacker}, who enjoys exploring the details
   of programmable systems and how to stretch their capabilities.
   Whereas a hacker tends to produce great hacks, a whacker only ends
   up whacking the system or program in question.  Whackers are often
   quite egotistical and eager to claim {wizard} status, regardless
   of the views of their peers.  2. A person who is good at
   programming quickly, though rather poorly and ineptly.