The Jargon File (version 4.4.7, 29 Dec 2003):

Windoze
 /win'dohz/, n.

    See Microsloth Windows. (Also Losedoze.)


The Free On-line Dictionary of Computing (30 December 2018):

Microsloth Windows
Windoze

    /mi:'kroh-sloth" win"dohz/ (Or
   "Windoze", /win'dohz/) A derogatory term for Microsoft
   Windows which is so limited by bug-for-bug compatibility with
   mess-dos that it is agonisingly slow on anything less than a
   fast 486.  Also called just "Windoze", with the implication
   that you can fall asleep waiting for it to do anything; the
   latter term is extremely common on Usenet.

   Compare X, sun-stools.

   [Jargon File]

   (1996-10-08)