adj. Abbreviation of "Fucked Up" as expressed in the NATO phoenetic alphabet. Used as a descriptor of something being awry.
Pennzoil 1, my engine's foxtrot uniform. Ejecting!
Yes, NATO alphabet (callsigns, really), but if you look at the acronym, FU, it's Fuck You.
Guy: Wanna go out with me?
Girl: Foxtrot Uniform.
<Girl walks away)
Guy: Whiskey Tango Foxtrot?