To go along a log as a racoon does.
1834. Our northward course brought us to the first fork of Boggy, where we cut a sycamore and crossed on it; part of the log was under water, and it was an altogether slippery business, especially for Irwin, who had received a kick a day or two before, and was obliged to straddle the log, and as they quaintly call it in the west, coon it across.Albert Pike, Sketches, &c., p. 77 (Boston).
1854. A deep chasm had, reaching across it, a small ancient looking cedar log, which had either to be walked or cooned.Letter to The Oregonian, Oct. 28.
1855. [He drove] his horse through the stream, while he cooned a log above it.W. G. Simms, Border Beagles, p. 96 (N.Y.).
1855. You will be relieved of your nag, and we will coon a log for the rest of our journey.Id., p. 319.
1886. In trying to coon across Knob Creek on a log, Lincoln fell in, and Gollaher fished him out with a sycamore brancha service to the Republic, the value of which it fatigues the imagination to compute.Nicolay and Hay, Abraham Lincoln: A History, Century Mag., xxxiii. 16 n. (Nov.) (N.E.D.)