Green’s Dictionary of Slang

(Aus./N.Z.) this afternoon.

1943		Baker ‘Influence of Amer. Sl. on Aus.’ in AS XVIII:4 255: Here are a few of the items included: [...] sarvo, this afternoon.
1946		Western Mail (Perth) 21 Mar. 17/3: I have to be down at the jetty again next Saturday sarvo.
1949		Mirror (Perth) 13 Aug. 6/2: My sort’s rat-bag cobbers are turning on a shivoo sarvo.
1986		G.A. Wilkes Exploring Aus. Eng. 7: In 1942, when there was an influx of American servicemen into Australia, the US War and Navy Departments issued a Pocket Guide to Australia which listed common expressions which might be encountered. The Guide explained that sarvo meant ‘this afternoon’, that woop-woop was ‘the sticks’, a wowser was ‘a sourpuss’.
1988		McGill Dict. of Kiwi Sl. 96/2: s’arvo this afternoon; eg ‘See you s’arvo.’.
1993		Aus. Word Map 🌐 sarvo this afternoon: I will go shopping the sarvo; I'll be there the sarvo.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].