Foo is the first
metasyntactic variables commonly used by
hackers and programmers. It is sometimes combined with
bar to make
foobar. This suggest that
foo may have originated with the
World War II slang term
FUBAR. The
jargon file has an extensive etymology of the word
foo at
[1].
See also bar, baz?, qux?, quux?, waldo?, fred?, xyzzy, thud?
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