dummy spit

From when babies have tantrums, and spit out any dummy that they may be sucking.

• Audio (General Australian):

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dummy spit (plural dummy spits)

1. (idiomatic, informal, chiefly Australia) The act of overreacting (as an adult) to a situation childishly, in an angry or frustrated manner.

   Did you hear about John's dummy spit over the management changeover?

• See Thesaurus:tantrum

• have a cow
• spit the dummy
• throw a hissy fit