Source : Free On-Line Dictionary of Computing

Discordianism
     
         /dis-kor'di-*n-ism/ The veneration of {Eris},
        also known as Discordia; widely popular among hackers.
        Discordianism was popularised by Robert Shea and Robert Anton
        Wilson's novel "Illuminatus!" as a sort of self-subverting
        Dada-Zen for Westerners - it should on no account be taken
        seriously but is far more serious than most jokes.  Consider,
        for example, the Fifth Commandment of the Pentabarf, from
        "Principia Discordia": "A Discordian is Prohibited of
        Believing What he Reads."  Discordianism is usually connected
        with an elaborate conspiracy theory/joke involving
        millennia-long warfare between the anarcho-surrealist
        partisans of Eris and a malevolent, authoritarian secret
        society called the Illuminati.
     
        See {Religion}, {Church of the SubGenius}, and {ha ha only
        serious}.
     
        [{Jargon File}]
     
        (1997-04-12)