(informal, idiomatic, chiefly, Australia) To overreact (as an adult) to a situation, in an angry and childish manner.
He'll really spit the dummy when he hears that he's not going on that trip.
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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.