smudge the prairie dog
the very beginning of a turd that is trying to sneak out of your anus...especially when you cant make it to a rest room. It will try and try to make its way out, but you have to keep on clenching to keep it in...
I was at the racetrack, watching the race, when I felt 'smudge the prairie dog' trying to make his way out. The shitter was about a mile away, so I had to fight with him all stinking day!