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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   op
      <job> /op/ 1. In England and Ireland, a common verbal
      abbreviation for "operator", as in system operator.  This is
      less common in the US, where sysop seems to be preferred.
      2. The general term for an IRC channel op.  Also, as a
      verb: to give someone channel op privileges.  Compare
      ircop.
      [Jargon File]
      (1997-12-12)