Green’s Dictionary of Slang

(Aus.) the heart.

1905		Duke Tritton’s Letter n.p.: My Grocer’s Cart was racing like grandfather’s clock when it slipped out of gear. After about ten seconds I managed to croak something that sounded like ‘Pleased to meetcha.’.
2002		Pete’s Aussie Sl. Home Page 🌐 grocer’s cart: the heart.