Green’s Dictionary of Slang

(Aus.) of a sheep, to steal.

1910		Northern Miner (Charters Towers, Qld) 6 Oct. 3/1: If the squatters, therefore, desire to retain enough shearers to undress their sheep, they will either have to go back to the old style of superintending their own shearing.
1932		Sydney Mail 18 May 36/2: To see a good shearer undressing a sheep is a delight to the eye, because all his actions are so smooth that, as the wool rolls off in furrows, its shearing looks the easiest thing in the world.
1953		Baker Aus. Speaks.