whacker

from WordNet (r) 3.0 (2006)

whacker
    n 1: something especially big or impressive of its kind [syn:
         {whacker}, {whopper}]

from The Collaborative International Dictionary of English v.0.48

Whacker \Whack"er\, n.
   [1913 Webster]
   1. One who whacks. [Colloq.]
      [1913 Webster]

   2. Anything very large; specif., a great lie; a whopper.
      [Colloq.] --Halliwell.
      [1913 Webster]

from Jargon File (4.4.4, 14 Aug 2003)

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.

from The Free On-line Dictionary of Computing (8 July 2008)

whacker

   [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.