Green’s Dictionary of Slang

(Aus./US) second-rate, inferior.

1973		S. Ace Stand On It (1979) 50: ‘How are you running, Stroker?’ ‘Fast as that shitpot engine will allow.’.
1975		Bulletin (Sydney) 26 Apr. 44: Dead set the best bake in history they give me and I got the book for a shit pot dud.
1977		(con. 1941) R. Beilby Gunner 100: We’re playing good-soldiers just to suit some shit-pot notion of yours.
1983		S. King Christine 472: I fought my way across half the little shitpot islands in the South Pacific.
1985		R.G. Barrett You Wouldn’t Be Dead for Quids (1989) 14: What’s the name of that shitpot little town you come from.
1991		M.B. ‘Chopper’ Read Chopper From The Inside 111: Walsh Street was a shitpot murder. It was without honor or courage.
2005		M.B. ‘Chopper’ Read Chopper 4 130: Loading a bloke up with a shitpot replica [...] is only turning a simple thing into a bloody nightmare.
2009		L. McIlvanney All the Colours 125: ‘Some shitpot town on the Ards peninsula’.