Ridiculously savory and delicious. Stuff as much as you can in the turkey and bake the rest in a separate pan, covered with tinfoil to keep it from drying out.
Sauté the onions, mushrooms, and celery in the butter.
In a separate pan, fry up the sausage, crumbling it as you cook, until it's browned. Combine the sausage, including the fat, with the vegetables, and add in the oysters with their broth.
Put the dry stuffing in a bowl. Add the broth and stir gently until it's all moistened. Add the vegetable-oyster- sausage mixture. Salt and pepper to taste.