Here is a diagram demonstrating its use.
That's right folks, it's the Butt-Out Tool! As the product description at the website says,
One of the more unpleasant chores of field dressing now takes just seconds to accomplish using the innovative Butt-Out Tool. This tool is the fastest, easiest way to disconnect the anal alimentary canal from deer or similar-sized game. Immediately after harvesting game, insert the Butt-Out Tool into the anal canal and twist until it grabs the membrane. Continue twisting another half turn, then steadily pull the Butt-Out Tool out of the canal. Extract 10" of membrane, tie the membrane off and cut. Its time-saving ease of use makes this the tool every deer hunter needs in his pack.
Go ahead and click the link for some fabulous testimonials on this handy little gadget! Now, I know all you anti-hunting types are in horror that we hunt at all. All the rest of you are probably now gagging on your breakfast. Thus far none of the three hunters at House of Lime has brought home meat to feed us this year. Somehow I think the deer got wind of this new gadget. In spite of the instinctive behavior of whitetail deer to lift their tails in warning to the rest of the herd I imagine them all bounding away with tails tucked and hindquarters clenched tightly.