Green’s Dictionary of Slang

(Aus.) an immigrant from the UK.

1912

Bulletin (Sydney) 15 Aug. 15/2: The new-chum jumped to his feet in dismay. ‘Crikey!’ he howled, ‘have all those trees been struck by lightning?’ This part (Moombooldool) is thick with tweed-cappers, and the mistakes they invent keep the countryside from ever feeling dull.