What is Déjà Foo?
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The peculiar feeling that you get when programming, leading you to believe that you've written the particular code or program that you are currently working on, before.
After refactoring his game engine for the fourth time, Vincent was struck with a distinct, uncomfortable sense of déjà foo.
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See also: Hitchhiker's Guide to the Galaxy.
The Answer to Life, the Universe and Everything. Also known as the Ultimate Answe..