[f. BUNK sb.1] intr. To sleep in a bunk; hence, to occupy rough sleeping quarters, camp out. Also, To bunk it. (colloq., chiefly U.S.)
1861. C. J. Andersson, Okavango River, xxvii. 317. They would not let us sleep in their huts; we had to bunk it out on the sand.
1884. J. G. Bourke, Snake Dance of Moquis, v. 53. My comrade and myself bunked together in the double bed.
1885. Pall Mall Gaz., 29 Aug., 6/1. The Orientals are a bunking people.