Green’s Dictionary of Slang

(Aus.) a lesbian; also attrib.

1941		Baker Popular Dict. Aus. Sl. 43: Lezo, a lesbian.
1966		Trimble 5000 Adult Sex Words and Phrases 121: leslie or lessie or lezo (Sl.) n. & adj. Homosexual, in the female sense; Lesbian.
1985		B. Humphries Traveller’s Tool 20: I’d be a mug if I didn’t admit that we’ve got our fair share of lezzos in Australia.
1999		G. Seal Lingo 114: Bisexuality (ac-dc) and terms for lesbians (dike, lezzo, butch) are well outnumbered by the terms for male homosexuality. While gay has become the accepted mainstream term, the vernacular is still full of other, less positive terms.
2003		McGill Reed Dict. of N.Z. Sl. 127: lezo/lezzo A lesbian. ANZ c1925.
2010		L. Redhead Thrill City [ebook] Five hundred if you want the whole lezzo shebang.
2012		A. Prentice ‘The Break’ in Crime Factory: Hard Labour [ebook] So you hang with the lesos, Munro? Sort of makes you a male fag hag.