The act in wich one heterosexual male shares the same bed with another. Most often caused by lack of choice.
Alex: "Last night at steffani`s party I got so wasted I had to sleep over. Thing was, Henry also got his liver in a knot so we had to share the only bed there."
Michael: "You went Bro`Bunkin! Any Broner?"
To go on an adventurous trip into the wild with a minimal of tools. Both literary and metaforicly.
Will: Let`s head over into that patch of brambles! and take off your shirt and pants, we`re going bare-backing-back-packing.
Barry: I`ll bring the flashlight!