(Australia, idiomatic) At maximum capability, intensity, or speed.
We had the car going flat strap down the highway when the cops pulled us over.
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(Australia, idiomatic) Extremely busy.
Can you call me back tomorrow, mate? I′m flat strap at the moment.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.