Green’s Dictionary of Slang

(Aus./N.Z.) tomorrow.

1919		W.H. Downing Digger Dialects 14: bukra (adv.) (Arab.) — To-morrow.
1921		N&Q 12 Ser. IX 424: Bukra. To-morrow.
1947		D. Davin For the Rest of Our Lives 256: Frank had found Mahomet almost in tears and had to reassure him with a smile and a ‘Buckra, buckra,’ that he’d be coming back.