Definition of Barney's bull in English:

Barney's bull

Pronunciation /ˌbɑːnɪz ˈbʊl/

noun

dialect, rare British, Australian, New Zealand
  • Used in various proverbial expressions and similes, as a type of someone or something in a very bad state or condition.

Origin

Mid 19th century; earliest use found in Morning Star (Hobart, Tasmania). Apparently from the genitive of the forename Barney + bull.