Foobar is a common placeholder name used in computer programming. It has been described as “the association of two metasyntactic variables: foo and bar”. These variables are often used in computer programming examples.

Most probably, “foo” and “bar” were derived from “foobar,” which in turn had its origins in the military slang acronym FUBAR. The most common rendition is “Fucked Up Beyond All Recognition”. (Several variant renditions exist, with, for example, the words “Fouled”, “Any Repair”, “Any Redemption”, or “All Reason” used instead of the versions above.)

Sjá: http://en.wikipedia.org/wiki/Fooba