FUBAR is an acronym meaning "fucked up beyond all/any recognition", or one of many variations (see below). It is attested in the United States Army and other military settings.
For purposes of euphemism, "fucked" is sometimes replaced with "fouled".
Depending on situation or habit, "all recognition" can be replaced with "any repair", "any redemption", "all reality", "all repair", or "all reason". Once the concept is understood, the specific words are irrelevant.
Electronics engineers say that SNAFU and FUBAR were used before World War II by repairmen sent out to repair phone booths. They had to report the situation at arrival to the scene, often on a very bad line, so they developed these acronyms to make themselves understood.
"Foo" appeared in a 1938 Warner Bros. Daffy Duck cartoon and the comic strip Smokey Stover, and bar was a popular English word long before that. FUBAR may have been influenced by the German word furchtbar, meaning terrible. It is pronounced with a soft cht, and probably made the transition during World War II.Network Working Group. RFC 3092 - Etymology of "Foo". 1 April 2001. despite April Fool's Day release, appears to contain reasonable information.
It is also possible that foobar is a phonological interpretation of the first letters of the Runic alphabet. Like Qwerty and Abcde, this expression might have attracted various computer programmers. In a museum at Aarhus, a large wooden bar with the runic enscription f u þ a r, where fu is pronounced like foo. However, the letter þ is actually pronounced like an unvoiced th, not a b (hence the name Futhark for the Runic alphabet).
"That puts this mission just south of FUBAR!"
"This mission is way beyond FUBAR!"
"This situation is looking seriously FUBAR-ED!"
"We are FUBAR!"
Others include the following: