mess-dos/mes-dos/ n. [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.