Green’s Dictionary of Slang

1. (UK prison, also kangar) chewing tobacco [chew n. (1)].

1954

J. Phelan Tramp at Anchor 38: The expert would ‘twiddle a kangar’ — i.e., let the warder suspect him of having tobacco.

2. (Aus.) money [screw n.¹ (7)].

1969		A. O’Toole Racing Game 6: On account of you being a mighty bloke, and sending Ape that kanga without asking any questions, we’re all agreed on one thing. You’re getting the biggest share [AND].
1978		E. Hanger 2D and Other Plays 44: Your daughter’s got a bit of kanga, but, hasn’t she?... Kanga?... Cash. That’s what they say in the bush [AND].