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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   FIXME
      <programming> A standard tag often put in comments near a
      piece of code that needs work.  The point of doing so is that
      a grep or a similar pattern-matching tool can find all such
      places quickly.  This is common in GNU code.  Compare XXX.
      [Jargon File]
      (2001-03-16)