Penguin
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Denial Of Service
Usually written "DoS"

OR

Disk Operating System. Usually named after the operating systems of 8bit micros, who's operating system didn't include memory management, multiuser or multiprocessing and only a thin abstraction if any over any hardware, so they only part of the Operating System that they actually implemented was the filesystem, hence, DOS.

MS-DOS (Microsoft DOS) was originally called QDOS, and was written in 2 weeks. QDOS stands for "Quick and Dirty Operating System". Microsoft promised IBM that they would cheaply license them an OS - they bought the rights to QDOS and started hacking it up from there...