Source : Free On-Line Dictionary of Computing

FIXME
     
         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)