MS-DOS 

Microsoft Disk Operating System.

Guy 1: MS-DOS is a great operating system.

Guy 2: Yeah, too bad few know how to use it.

MS-DOS by Anonymous August 11, 2003

MS-DOS 

An operating system which is also the origin of the name of a notorious family. Acronym for MicroSoft Disk Operating System.

Fundo thought MS-DOS sounded cool, but two wasn't his favorite number, so he changed his last name to something else that was similar to that.

MS-DOS by authOOr August 8, 2006

MS-DOS 

A good operating system purchased by Microsoft and developed by them. It was a revolutionary command line OS. The final version, 6.22, was released in 1994.

DOSBox is a good emulator.

MS-DOS is a great OS isn't it Bob?
Certainly better than Windows 8! XD
That is not saying much. Even Windows Me is better than windows 8?
What about Vista?
Oh, it was an OK OS. Like Windows 7.

MS-DOS by BristolBrick May 3, 2016