Green’s Dictionary of Slang

(Aus.) good, often as any plum pud, any good.

1924		Mail (Adelaide) 16 Feb. 1/4: ‘Is he any good?’ is rather tame. Nowadays it is ‘Is he any plum pud?’ or [...] ‘Is he any plum?’.
1953		Mirror (Perth) 12 Sept. 17/3: The rhyming slang for ‘good’ has, at least since World War I, been ‘plum pud’.
2002		Pete’s Aussie Sl. Home Page 🌐 plum pud: good .