A rural saying originating from
Australia. To be "On the bird's back" essentially means being mid-transit; approaching a predetermined location, event, or gathering agreed upon by friends; To almost be ready for something.
Australians in particular use it as a euphemism to reduce swearing around children or foreigners who
may take offence to typical Australian dialect, E.g., "Give me a second you whining cunt, I'm almost
fucking there." is replaced by a simple "I'm still on the birds back mate".
Person 1: "Where the hell are you!?".
Person 2: "Still on the bird's back man".
Person 1: "Right, see you soon dude".
........
Person 1: "Honey I'm home! How's
dinner going?"
Person 2: "Still on the birds back".
Person 1: *
beats wife to the tune of monster
mash*