Green’s Dictionary of Slang

(Aus.) a fool, also attrib.

1941		H. Percy Here’s H. Percy 23: And he wasn’t such a big shot in the days before the war; / In fact he was a dillpot as the boss would often say.
1947		Advertiser (Adelaide) 4 July 13/4: The other lacrosseurs cried one and all / ‘You lamebrain dillpot poet. / The racquet’s not meant to hit the ball. / It’s to catch it in and throet’.
1954		House Hansard: Repatriation Bill 30 Sept. n.p.: However, we do not want the Minister to take the view that this is a sort of dillpot amendment which can be easily knocked over.
1955		N. Pulliam I Travelled a Lonely Land (1957) 232/2: dollypot (dillypot, dil) – a simpleton.
1994		D. Kennedy Dead Heart n.p.: Look at this dillpot. Told you to pick no foreigner. Told you to find some Ocker, some dumb bushie who’d fit in here.