Someone who is unwilling to take a dump in a public restroom, and would rather wait till they are home no matter how bad they have to go. Most likely due to unsanitary conditions.
Person 1: Man, I have to take a wicked shit!
Person 2: Well the restroom is over there!
Person 1: Nope, I am a homepooper. I only take a dump at home.
But honestly with the philosophies of our peers and greats like khant that tried to steer us away of the tram problem, we really have let him down and just steered back in our Homophophorus Quibelica