Green’s Dictionary of Slang

(Aus.) quarantine.

2001		Navy News 19 Feb. 9/1: HMAS Gladstone helped the Australian Quarantine Service [...] The ‘Quarro’s’ education program extended to RAmN personnel [etc].
2020		Picterio: @mrsneil90 Apr. 🌐 Sometimes all a girl needs in quarro is 2 visitors, booze and some art.
2021		Twitter 2 Aug. 🌐 I have hotel and home quarantine! But not quarantine on its own, true. And no quarro.
2022		J. Lambert private email 🌐 Still, after a week’s quarro, we are back on deck and all is well.