mess-dos

mess-dos /mes-dos/ n.  Derisory term for MS-DOS.  Often
   followed by the ritual banishing "Just say No!"  See
   {{MS-DOS}}.  Most hackers (even many MS-DOS hackers) loathe
   MS-DOS for its single-tasking nature, its limits on application
   size, its nasty primitive interface, and its ties to IBMness (see
   {fear and loathing}).  Also `mess-loss', `messy-dos',
   `mess-dog', `mess-dross', `mush-dos', and various
   combinations thereof.  In Ireland and the U.K. it is even sometimes
   called `Domestos' after a brand of toilet cleanser.