/mes-däs/
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.