Green’s Dictionary of Slang

jackass n.²

In phrases

from jackass to jackass

(Aus.) the whole day, ’from dawn to dusk’.

1925

Dly Mercury (Mackay, Qld) 13 May 3/4: There is no basic wage for them, and it is only by yackering from jackass to jackass and taking no heed of the hours that ends can be made to meet.