In Australia, when a group is buying coffees, lunch or a round at the pub, “It’s my shout” usually means “I’m paying this time”. It has nothing to do with raising your voice.
A: Who’s getting the coffees?
B: It’s my shout. What are you having?
In informal Australian and New Zealand English, shout can mean buying food or drink for someone. You can say “I’ll shout you a coffee”, or simply “My shout” when it is your turn. The expression is strongly associated with rounds of drinks but is also natural for coffee and other small shared purchases.
For a formal business meal, “I’ll get this” or “This one’s on me” is more neutral. “It’s my shout” carries a relaxed sense of mates taking turns to pay.
Sources:
https://dictionary.cambridge.org/dictionary/english/shout
https://www.oxfordlearnersdictionaries.com/definition/english/shout_1
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