Source : Free On-Line Dictionary of Computing

fnord
     
        1.  A word used in {electronic mail} and {news}
        messages to tag utterances as surrealist mind-play or humour,
        especially in connection with {Discordianism} and elaborate
        conspiracy theories.  "I heard that David Koresh is sharing an
        apartment in Argentina with Hitler. (Fnord.)"  "Where can I
        fnord get the Principia Discordia from?"
     
        2.  A {metasyntactic variable}, commonly used by
        hackers with ties to {Discordianism} or the {Church of the
        SubGenius}.
     
        The word "fnord" was invented in the "Illuminatus!" trilogy by
        Robert Shea and Robert Anton Wilson.
     
        [{Jargon File}]
     
        (1995-02-28)