Green’s Dictionary of Slang

woppidown n.

[? whop v. (1) it down on the plate]

(Aus.) a damper.

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[Aus]Baker Popular Dict. Aus. Sl.
E. Kynaston Bk of the Bush 59: Damper is [...] not particularly palatable and the bushmen gave it suitably descriptive names: bunghole, nightmare, dorkum, woppidown.