Green’s Dictionary of Slang

(orig. Aus.) help, assistance.

1906		Marvel 20 Oct. 368: Here, give me a bunk up.
1919		W.H. Downing Digger Dialects 14: bunk-up — A lifting up.
1924		(con. WWI) A.G. Pretty Gloss. of Sl. [...] in the A.I.F. 1921–1924 (rev. t/s) n.p.: bunk-up. A lifting up.
1938		F.D. Sharpe Sharpe of the Flying Squad 51: I was given a bunk up.
1953		J. Franklyn Cockney 285: One does not give another a leg up, but a bunk up.
1968		P. Terson Apprentices (1970) I iii: I’m going up. Right. Give us a bunk up.
1978		(con. 1940s) J.G. Farrell Singapore Grip 164: I was in trouble and your dear father [...] gave me ‘a bunk up’ (please excuse my slang expression of speaking!).
1984		Flame : a Life on the Game 39: John gave me a bunk-up and I landed on the grass on the other side.
1997		Roger’s Profanisaurus in Viz 87 Dec. n.p.: bunk up [...] 2. Assistance climbing, as in: ‘Shit. I’m so pissed I can’t get onto the bed. Giz a bunk up will ya?’.