[semi-obsolescent now that DOS is] Derisory term for MS-DOS. Often
followed by the ritual banishing Just say No!
See
MS-DOS. Most hackers (even many MS-DOS hackers)
loathed MS-DOS for its single-tasking nature, its limits on application
size, its nasty primitive interface, and its ties to IBMness and
Microsoftness (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.