Green’s Dictionary of Slang

(Aus.) Japanese; in a Japanese style.

1897		Wilmott & LeBrunn [perf. Marie Lloyd] The Geisha 🎵 Every little Jappy chappie’s gone upon the Geisha.
1904		Sydney Sportsman (Surry Hills, NSW) 3 Feb. 2/2: Miss Evans sings and dances a Jappy trifle entitled, ‘Pinky-Panky-Poo' [...] and gets treble encores .
1910		Bulletin (Sydney) 13 Oct. 20/2: At a previous day’s racing Mrs. Verney wore an artistically Jappy get-up of grey voile with a foot-wide sash tied high at the back in a huge bow, and long ends falling to the bottom of the skirt.