In Australia, flat chat is an informal expression meaning extremely busy or operating at maximum speed or capacity. Cambridge labels it Australian English informal.
A: How’s work been?
B: Flat chat. I haven’t stopped all day.
It can describe a person or a machine at full load. The aircon is running flat chat means it is working at full capacity. Very busy is perfectly natural; flat chat simply sounds more colloquial and distinctly Australian. In formal emails or reports, extremely busy is clearer.
Source:
https://dictionary.cambridge.org/dictionary/english/flat-chat
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