mallee root, n. — Green’s Dictionary of Slang

mallee root n.

[uses of play on root n.¹ + rhy. sl. prostitute, ult. Abor. mallee, eucalyptus]

1. (Aus.) a prostitute.

1941		Baker Popular Dict. Aus. Sl. 45: Mallee root, a prostitute.
1972		G.W. Turner Eng. Lang. in Aus. and N.Z. 101: Mallee root for prostitute.
1999		G. Seal Lingo 90: Some other examples: [...] kembla grange change (money); mallee root for prostitute, a drollery on the slang term for sexual intercourse.
2002		Pete’s Aussie Sl. Home Page 🌐 Mallee root: a prostitute.

2. (Aus.) sexual intercourse.

c.1943

S .J. Baker Aus. Vulgarisms [t/s] 10: mallee root: The act of coition.