Green’s Dictionary of Slang

Bulli Pass n.

[rhy. sl. = arse n.]

(Aus.) the anus, the buttocks.

[Aus]G. Seal Lingo 90: Some other examples: bulli pass (sometimes simply bulli or pass) for arse (compare with the British ‘Khyber Pass’, or ‘Khyber’, which is also used here).

In phrases

got the arse at Bulli Pass

(Aus.) a phr. used to denote an unsatisfactory situation.

[Aus]G. Seal Lingo 93: An apparently indigenous form of rhyming slang evolved here during the depression of the 1930s, according to Sidney Baker. This consisted of short rhymes on place names, usually with a sombre reference to unemployment and hardship, such as things are crook in tallarook, got the arse at bulli pass and no work in bourke.