Dictionary of Australian slang . 2013.
aftie — Australian Slang afternoon … English dialects glossary
afto — /ˈaftoʊ/ (say ahftoh) noun → arvo. Also, aftie. {shortened form of aft(ernoon) + o} …
arvo — /ˈavoʊ / (say ahvoh) noun Colloquial afternoon. Also, aftie, afto. {modified shortened form of afternoon + o} …