plinkity plonk, n. — Green’s Dictionary of Slang

plinkity plonk n.

also plinketty plonk, plink plonk

[rhy. sl. = vin blanc, white wine; orig. WWI milit.]

(Aus.) white wine; cheap or second-rate wine.

1919		S. Graham Private in the Guards 74: Thank God, they haven’t taken Epernay, that's where the Plinketty Plonk (vin blanc) comes from.
1921		N&Q 12 Ser. IX 347: Plinkity-Plonk. Vin Blanc.
1930		(con. WWI) H. Williamson Patriot’s Progress IV. 137: Nosey and Nobby shared a bottle of plinketty plonk, as vin blanc was called [OED].
1992		R. Puxley Cockney Rabbit 149: Plink Plonk Vin Blanc.
2002		Pete’s Aussie Sl. Home Page 🌐 plinkity plonk: plonk, vin blanc, any wine.