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foo is a metasyntactic variable, used in the NetHack context to represent in a larger statement a word that can take on several values. The most well known of these uses is foocubus (to represent a succubus or incubus), though footrice is also common. To fooproof an object is to make it rustproof, fireproof, corrodeproof or fixed. Foo is a carry over from hacker Jargon. See the jargon file.

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