The period of time between taking a dump and knowing there's nothing else to come, making it safe to do the paperwork and flushing.
The train was leaving in a couple of minutes but he was in shit limbo. Maybe he'd catch the next one.
When youre unaware if you have to shit or just fart
Bro 1: I think that Chipotle I had put me in shit limbo dude
Bro 2: better go sit on the toilet just in case
Bro 1: good idea