The New Hacker's Dictionary
DPer /dee-pee-er/ n.
Data Processor. Hackers are absolutely amazed that suits use this term self-referentially. Computers process data, not people! See DP.
Dr. Fred Mbogo /*m-boh'goh, dok'tr fred/ n.
[Stanford] The archetypal man you don't want to see about a problem, esp. an incompetent professional; a shyster. "Do you know a good eye doctor?" "Sure, try Mbogo Eye Care and Professional Dry Cleaning." The name comes from synergy between bogus and the original Dr. Mbogo, a witch doctor who was Gomez Addams' physician on the old "Addams Family" TV show. Interestingly enough, it turns out that under the rules for Swahili noun classes, 'm-' is the characteristic prefix of "nouns referring to human beings". As such, "mbogo" is quite plausible as a Swahili coinage for a person having the nature of a bogon. Compare Bloggs Family and J. Random Hacker; see also Fred Foobar and fred.
dragon // n.
[MIT] A program similar to a daemon, except that it is not invoked at all, but is instead used by the system to perform various secondary tasks. A typical example would be an accounting program, which keeps track of who is logged in, accumulates load-average statistics, etc. Under ITS, many terminals displayed a list of people logged in, where they were, what they were running, etc., along with some random picture (such as a unicorn, Snoopy, or the Enterprise), which was generated by the 'name dragon'. Usage: rare outside MIT -- under Unix and most other OSes this would be called a 'background demon' or daemon. The best-known Unix example of a dragon is cron(1). At SAIL, they called this sort of thing a 'phantom'.
Dragon Book // n.
The classic text "Compilers: Principles, Techniques, and Tools
drain // v.
[IBM] syn. for flush (sense 2). Has a connotation of finality about it; one speaks of draining a device before taking it offline.