A portable fiberglass commode.
This word arose early in the twentieth century, and is reputed to be an acronym for "Keep Your Bowels Open." The word is universal among Boy Scouts and RAGBRAI bicyclists in Iowa.
The kybo door has a crescent moon carved in it. The purpose of this moon is to provide access for flies.
Inside a kybo is a bench with one or two holes in it. A kybo with a single hole in the bench is called a one-holer. A kybo with two holes in the bench is called a two-holer.
Hanging on the wall inside the kybo is a Sears Roebuck catalog. Or maybe a big tin can full of corn cobs (from which arose the phrase, rough as a cob).
A kybo may have a sheet metal chimney extending above the roof. This is called a fart muffler.
Experienced users visit the kybo at mealtimes, when all the flies gather in the dining room.
Who went in the kybo and died.
His brother, named Lou,
Went and died in there too.
Now they're interred side-by-side.
Lem 'n' Jake, they was a-sittin' in the kybo, when Jake yells "Dagnab it! I done dropped a nickel down the hole!" Ol' Jake gets up, reaches in his bib overhalls, pulls out a twenty dollar bill, an' tosses it down the hole.
"Hey, Jake," drawls ol' Lem, "Why in tarnation you bin tossin' that twenty down the hole fer?"
An' Jake says, "Well now, ya don't think I'm gonna go down there jest to fetch a nickel, do ya?"