Nervous about the thought of pooping and someone hearing you, and or walking in after smelling your deed. This results in an anxiety of only being able to poop in ones own house, preferably with no one in the house.
/or leaving skid marks in someone else's bowl.

the thing that you don’t have when you’re phones percentage is over 20

Being afraid to defecate in response to anxiety or fear that somebody else in the rest room can hear you do your business.