Source : WordNet®

jock
     n 1: a person trained to compete in sports [syn: {athlete}]
     2: a support for the genitals worn by men engaging in strenuous
        exercise [syn: {athletic supporter}, {supporter}, {suspensor},
         {jockstrap}]

Source : Free On-Line Dictionary of Computing

jock
     
        1. A programmer who is characterised by large and somewhat
        {brute-force} programs.
     
        2. When modified by another noun, describes a specialist in
        some particular computing area.  The compounds "compiler jock"
        and "systems jock" seem to be the best-established examples.
     
        [{Jargon File}]
     
        (1995-01-19)