The Computer Contradictionary

Stan Kelly-Bootle's "laxicon" of computer terms. It's an excellent example of "cynical lexicography" in the tradition of Ambrose Bierce's "The Devil's Dictionary". Kelly-Bootle adds in the "Guide":

The meaning of an entry should always be ascertained before consulting this dictionary.

That said, this is an extremely funny dictionary, with a lot of Kelly-Bootle's typical word play and impressive store of knowledge on display.

See "The Hacker's Dictionary", "The New Hacker's Dictionary", etc. for more literal definitions of computer terms and usage.