Source : Free On-Line Dictionary of Computing

quux
     
        /kwuhks/ [Mythically, from the Latin semi-deponent verb quuxo,
        quuxare, quuxandum iri; noun form variously "quux" (plural
        "quuces", anglicised to "quuxes") and "quuxu" (genitive plural
        is "quuxuum", for four u-letters out of seven in all, using up
        all the "u" letters in Scrabble).]  1. Originally, a
        {metasyntactic variable} like {foo} and {foobar}.  Invented by
        {Guy Steele} for precisely this purpose when he was young and
        naive and not yet interacting with the real computing
        community.  Many people invent such words; this one seems
        simply to have been lucky enough to have spread a little.  In
        an eloquent display of poetic justice, it has returned to the
        originator in the form of a nickname.
     
        2. See {foo}; however, denotes very little disgust, and is
        uttered mostly for the sake of the sound of it.
     
        3. {Guy Steele} in his persona as "The Great Quux", which is
        somewhat infamous for light verse and for the "Crunchly"
        cartoons.
     
        4. In some circles, used as a punning opposite of "crux".
        "Ah, that's the quux of the matter!" implies that the point is
        *not* crucial (compare {tip of the ice-cube}).
     
        [{Jargon File}]