Source : Free On-Line Dictionary of Computing

blurgle
     
        /bler'gl/ [Great Britain] Spoken {metasyntactic variable}, to
        indicate some text that is obvious from context, or which is
        already known.  If several words are to be replaced, blurgle
        may well be doubled or trebled.  "To look for something in
        several files use "{grep} string blurgle blurgle"."  In each
        case, "blurgle blurgle" would be understood to be replaced by
        the file you wished to search.  Compare {mumble}.
     
        [{Jargon File}]