n. Derisory term for MS-DOS. Often followed by the ritual banishing "Just say No!"
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.