more interesting than the Foo Fighters: this definition of ‘foo’
jargon. /foo/ A sample name for absolutely anything, especially programs and files (especially scratch files). First on the standard list of metasyntactic variables used in syntax examples. See also bar, baz, qux, quux, corge, grault, garply, waldo, fred, plugh, xyzzy, thud. The etymology of “foo” is obscure.