Green’s Dictionary of Slang

Bugs Bunny n.

[rhy. sl., ult. f. Warner Bros. character Bugs Bunny, created 1940]

1. (orig. Aus.) money.

[Aus]R. Aven-Bray Ridgey-Didge Oz Jack Lang 9: He wasted no time in diving into his burrow and extracting his willy. The Bugs Bunny he had agreed to was handed over.
[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 32/2: bugs bunny n. 2 money.
D. Shaw ‘Dead Beard’ at www.asstr.org 🌐 Vince was ambitious. Soon got himself tooled up with a lady of bristol and began turning over arthur j. ranks all over South London – like he said, they were where the bugs bunny was kept.
[Aus]T. Peacock More You Bet 67: ‘Money’ in rhyming slang remains ‘Bugs Bunny’, but it might also be referred to as ‘cash’, or ‘coin’, or ‘oscar’, or ‘moolah’, or ‘notes’, or ‘bills’, or ‘chips’ or ‘brass’, or ‘dosh’, or ‘dough’, or ‘bread’, or ‘biscuits’, or ‘bullets’, or ‘ammunition’.
[Aus]Betoota-isms 244: ‘Davo never shouts a round, he’s so tight with his Bugs Bunny’.

2. (N.Z. prison) .

[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 32/2: bugs bunny adj. 1 funny.