Green’s Dictionary of Slang

(Aus.) evening.

1955		N. Pulliam I Travelled a Lonely Land (1957) 63: Toti it all up and then communicate with the head waiter at the place where the mob’s going that evo.
2000		Hartford Courant (CT) sect. D 5 Sept. 27/2: G’Day from Down Under [...] You’re looking flash as a rat with a gold tooth this evo.
2002		Larry’s Aussie Sl. and Phrase Dict. 🌐 Evo evening.