Green’s Dictionary of Slang

(Aus.) excellent, wonderful, perfect, first-class.

1980		Aus. Women’s Wkly 14 May 239s/2: I think it would be a ripper film.
1985		B. Humphries Traveller’s Tool 126: No Uni ratbag can try and tell me the good Lord didn’t throw this ripper planet together.
1992		K. Lette Llama Parlour 55: ‘I thought your script [...] was tops.’ They looked at me blankly. ‘Ripper.’ Still no reaction.
2002		Guardian G2 23 May 10: Reviews to die for (’Bloody ripper, mate’ – Melbourne Age).
2016		N. Cummins Adventures of the Honey Badger [ebook] Another ripper trip.