Source : Free On-Line Dictionary of Computing

buglix
     
        /buhg'liks/ Pejorative term referring to {DEC}'s {ULTRIX}
        {operating system} in its earlier *severely* buggy versions.
        Still used to describe ULTRIX, but without nearly so much
        venom.  Compare {AIDX}, {HP-SUX}, {Nominal Semidestructor},
        {Telerat}, {sun-stools}.