Green’s Dictionary of Slang

Port Melbourne Pier n.

(Aus.) an ear.

1942		Sidney Mirror 14 Oct. in Baker (1945) 269: Blimey no Mark Foy is going to give me a dig in the grave. Yer might take me Port Melbourne Pier off.
1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
1983		R. Aven-Bray Ridgey-Didge Oz Jack Lang 10: He strained his Port Melbourne Pier to hear what they were saying.
1990		Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Port Melbourne piers. Rhyming slang for ears.