by 1944, acronym from fucked up beyond all recognition. Said to be military slang originally.
Totally botched and confused; snafu
[WWII armed forces; fr fucked up beyond all recognition] fubb adj FUBAR, SNAFU [WWII armed forces; fr fucked up beyond belief] fubis (FOO bis) sentence An irritated or defiant comment [1950s+ Army; fr fuck you, buddy, I'm shipping]