Green’s Dictionary of Slang

f.o.q.! excl.

[SE fly off/fuck off! excl. quickly]

(Aus.) leave! go away!

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[Aus](con. WWI) A.G. Pretty Gloss. of Sl. [...] in the A.I.F. 1921–1924 (rev. t/s) n.p.: f.o.q. Fly off quickly; fuck off quickly.