Green’s Dictionary of Slang

(Aus.) of a woman, a fool, a simpleton.

1950		Sun (Sydney) 25 Jan. 2/6: That rugged fellow George Wallace has been touring Victoria and New South Wales [...] He discovered a new Australian character called a ‘clunk’ — the equivalent of the English village idiot. Female of the species, usually in the maid class, is called a ‘gloik’.
1953		Baker Aus. Speaks.
1984		Partridge DSUE (8th edn) 471: since ca. 1910.
2005		B. Hare Urban Grimshaw 32: Watch me leave these poor, hopeless gloits.