In my experience as a boy scout, a portable toilet or outhouse was often referred as a "kybo". I did not know how that was spelled until today, but whenever I read "Kibo" in Erf lore, I think of that term. It turns out that this was a fairly common experience for other scouts too. Excerpt from Wikipedia entry for "Outhouse":
In the Scouting Movement in North America, a widespread term for outhouse is "kybo". This appears to have originated from camps which used Kybo brand coffee cans to hold lye or lime which was sprinkled down the hole to reduce odor. "Keep Your Bowels Open" may be a backronym.