Green’s Dictionary of Slang

egg and spoon n.

[rhy. sl. ]

1. a black person [coon n. (5)].

[UK]R. Puxley Cockney Rabbit.
[Aus]Bug (Aus.) 1 Nov. [Internet] Mundine’s problem which prevents him making the Australian side is not that he is an egg and spoon, but that he is an uppity coon.

2. (Aus.) a fool, a silly person [goon n.1 (1)].

[Aus]Pete’s Aussie Sl. Home Page [Internet] egg and spoon: a goon, a silly person .

3. (Aus.) a pimp [hoon n. (1)].

[Aus]Bulletin (Sydney) 26 Apr. 46: Rhyming slang did filter through into the idiom. but the knock-abouts quickly turned most of the phrases into shortened versions – [...] comics (short for comic cuts; guts or belly); egg (short for egg and spoon: hoon, or prostitute’s pimp); onka (short for Onkaparinga: linger).
[Aus]Tupper & Wortley Aus. Prison Sl. Gloss. [Internet] Egg and spoon. Rhyming slang for hoon, ie a pimp. Sometimes just egg.
[Aus]G. Seal Lingo 91: An egg and spoon is a hoon.