What is "foo"?
"The terms foobar (/ˈfuːbɑr/), fubar, or foo, bar, baz and qux (alternatively, quux) and sometimes norf and many others are sometimes used as placeholder names (also referred to as metasyntactic variables) in computer programming or computer-related documentation. They have been used to name entities such as variables, functions, and commands whose exact identity is unimportant and serve only to demonstrate a concept. The words themselves have no meaning in this usage. Foobar is sometimes used alone; foo, bar, and baz are sometimes used, when multiple entities are needed."
Wikipedia page source
Also, in the list of U.S. Government Military Acronyms:
FUBAR – Fucked Up Beyond All Recognition (or Repair)
How amusing!
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