MOJO- I think you win the prize for "The Scariest Moment when Deer HUnting"
I've heard of people using zip loc bags or a hospital urinal to whizz in while they are in a tree. I suppose you could just turn around and let it fly if you had to take a dump, but I've been told that the smell of droppings from a meat eater (us humans who hunt) might spook a deer. I don't know, I've never compared the smell of them.