Green’s Dictionary of Slang

bikkies n.

[dimin. of SE biscuits and thus the roundness of coins]

(Aus.) money; thus big bikkies, a large amount of money.

[Aus] ‘Whisper All Aussie Dict.’ in Kings Cross Whisper (Sydney) xxxii 6/1: bikkies: Money.
E. Taylor Mrs Palfrey at the Claremont (1982) 153: ‘Bikkies?’ [...] Mrs Palfrey took one.
[Aus]D. Ireland Burn 59: He didn’t come across [...] and there I was, minus my bikkies.
[Aus]B. Humphries Traveller’s Tool 90: I played an ultra-modest role in a sequence of events that led to most of the above-mentioned stars cracking it for big bikkies in Easy Street, Fat City.
[NZ]McGill Dict. of Kiwi Sl. 14/2: bikkies money; usually ‘big bikkies’, a lot of money.
[NZ]A. Duff One Night Out Stealing 105: Not to mention the big bikkies. Very big.
[NZ]McGill Reed Dict. of N.Z. Sl. [as cit. 1988].
D. Gutman The Get Rich Quick Club 45: ‘Big Bikkies say that again!’ Rob said excitedly. So I said it again: ‘You think you’re going to get rich quick washing cars?’.
[Aus]S. Maloney Sucked In 165: More than thirty grand all up [...] Big bikkies in those days.