Green’s Dictionary of Slang

(Aus.) the voice.

1905		Duke Tritton’s Letter n.p.: I go to Roll And Lurch every Sunday, and the Winchcombe Carson reckons I’ve got a bosker Let’s Rejoice, and often gets me to sing Her’s And Him’s on my Pat Malone.
2002		Pete’s Aussie Sl. Home Page 🌐 let’s rejoice: the voice.