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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!
DOS by ravingidiot July 5, 2004
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Denial of Service, a very lame way of making it so a computer cant access a specific resource. Usually connected to IRC.
Ebay got DoS'd.
DoS by louis October 22, 2001
Related Words
dosser DoS dose Doss dosh Doser Dosed Dose One doster Dosi
dude, last night i was soooo DOS
DOS by Dr. Foster January 28, 2009
dos by Jessica Sanford December 17, 2008
Damn that girl is a d.o.s. Pronounced dawse.
DoS by ninja December 7, 2002
number 2 in spanish. lol its not taking a sh**. Count how many fingers you hold up when you give the peace sign. yea thats 2
Luis:Oye loco que paso!
Marco: un raton me mordio mi dos dedos!
``translation``
Luis:Yo what happened man!
Marco: A rat bit 2 of my fingers!
dos by Kevin Cassidy July 17, 2005
the opposite of donts
Dese are the dos and donts of snipe hunting
DoS by wilburs September 20, 2004