When you are riding with your boss all day and know you can't ask your boss to pull over so you can have a shit.
On your first day at the new office when you can't ask the receptionist or your new boss where the bathroom is only to be gone for 20 minutes dropping the bomb.
I was up against two deadlines and had meetings throughout the day - I had to drop a deuce but I knew I would be pinching a no shitter which made me sweat and my guts quiver.
This occurs when one takes a shit which passes cleanly through the rectum withoutleaving any smeared shit in the ass-crack. Upon wiping, one will find their toilet paper spotless.....no muss no fuss