Green’s Dictionary of Slang

tear-arse n.1

also tear-ass
[their effect on the stomach; arse n. (1)/ass n. (2)]

1. cheese.

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[UK]Partridge DSUE (8th edn) 1209/2: C.20.

2. (Aus./N.Z.) treacle, golden syrup.

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[Aus]Baker Aus. Lang. 81: Consider, for example, these slang names for treacle and golden syrup: longtail, spare boy, Kidman’s blood mixture, Kidman’s joy, beetle bait, black jack, bullocky’s joy, cocky’s joy and tear-arse.
[NZ]McGill Reed Dict. of N.Z. Sl. 209: teararse Treacle or golden syrup, with reference to its laxative qualities. ANZ c.1920.