Green’s Dictionary of Slang

arsey-tarsey v.

[arse n. (1) + sfx -y + redup.]

(Aus.) to fall upside down.

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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.: arsey-tarsy. To fall upside down.