Green’s Dictionary of Slang

f.u.b.i.s. phr.

also f.u.b.i.d.

fuck you buddy, I’m shipping out / fuck you buddy, I’m detached.

[US]Wentworth & Flexner DAS (Supplement) 685: Fubis Fuck you, buddy, I’m shipping (out). Army use since c.1960.
S. Dutch ‘Printing’ on University of Wisconsin 🌐 These were just a few of a host of World War II acronyms, including: [...] fubid: f*** you buddy, I’m detached (that is, not under your command).