Green’s Dictionary of Slang

1. a piece of excrement adhering to the anus.

1890–1904		Farmer & Henley Sl. and Its Analogues.
1922		‘J.H. Ross’ Mint (1955) 122: Up, down: make the clinkers rattle round your shitty arse-holes.
1941		in G. Legman Limerick (1953) 311: Then when she wiped off her bung / Of the clinkers that thereunto clung.
1988		J. McDonald Dict. of Obscenity etc.
1997		Roger’s Profanisaurus in Viz 87 Dec. n.p.: clinkers Aus. n. Difficult to remove poo particles; winnits; kling-ons.
2003		N. Griffiths Stump 164: He [...] reaches down under his arse and rummages and sighs. — That’s berrer. Shifted a few clinkers.
2011		S. Kelman Pigeon English 64: Don’t lend Ross Kelly your pen. He picks his arse knlinkers with it.

2. a piece of excrement.

1993		S. King Dolores Claiborne 26: Most days there was apt to be a clinker in the pan along with the pee.
2001		S. King Dreamcatcher 170: He just dropped a clinker.