1) Various forks of Gary Kildall's cp/m. These usually use monolithic singletasking, although programs running under DOS can be written to exhibit multitasking.

2) Microsoft DOS, one of Microsoft's first example's of making money off of borrowed code. Microsoft bought QDOS (Quick and Dirty Operating System) from Tim Patterson in the early 80s. As a result of this, a chain reaction started and Microsoft products now run on approximately 90% of all computers despite their steep prices and reputation of crashing. MS-DOS uses the FAT12 and FAT16 systems natively, and are also fundamental parts of non-NT Windows implementations.
1) DOS is teh ubar OS

2) Oh snap! I lost my DOS disks! Now I gotta pay $135 for a new liscenced copy or else the RIAA will hunt my ass down!
by ravingidiot July 5, 2004
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DOS short for daughter of saton
James: dude!! shes the DOS
Mike: No F****** way!!!
by TheMainMan March 30, 2006
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Teacher: Who knows what the walking bass line is?
Student: Does it go "do do do do do do do do"?
Teacher: IT does well done
by Emma Swan bitch January 17, 2018
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A brand of cough sweets produced in the 1980s. Excessive consumption caused effects similar to those of speed.
And you're standing at the chemist in Boots
Coughing up your guts like you're at deaths door
All this for a packet of Do-Dos
by Clifftoru January 11, 2009
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an abbreviation of indo which is slang for marijuana
im finna go pick up some do do
by fotweny November 10, 2004
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