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1.
One of the many words that Australians have cut syllables off and replaced with "-o". This one represents the hours after 12pm, and is used by people, myself included, who can't be bothered saying "-fternoon".
Hey Davo, I'm goin' to the servo for arvo smoko.

Translation: David, I'm going to the service station to purchase some food for the afternoon break.
by Choda Boy 57 September 08, 2006
638 119
 
2.
Short for afternoon
I'll see you tomorrow arvo.
by Gina January 20, 2003
367 102
 
3.
afternoon
by VAKI5 August 17, 2003
235 125