When 2 people are neighbors in public restroom stalls, but remain comfortable having a normal conversation while dropping a deuce.
A variation of "piss pals" from Adam Sandler.
i.e. Piss pals, dump dudes, toilet talkers, commode comrades, bowel buddies.
Dude, I was walking to the restroom the other day at work, about to take a dump. Along the way, my boss followed me and started talking. We ended up having a normal conversation while simultaneously dropping deuces. We became shit pals.