What does foo mean?

Question

What is foo?

Answer 1

The terms foobar, fubar, or foo, bar, baz and qux (alternatively, quux) 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 purpose is ...
https://www.quora.com/What-does-foo-mean-in-computer-science

Answer 2

Foo is short for Foobar, which is another way of writing FUBAR, which is a term from World War II, which stood for
F%@ed Up Beyond All Recognition.