when you are taking a poop in a public place and someone walks in and you dont want them to hear you in the stall taking a loud poop so you clinch your butt to be quiet
Taking the limp penis and pushing in back into you as far as it can go. Then you take the loose scrotum (best when out of a hot-tub or hot shower) and fold it from under, on to the top of your penis therefore resembling a turtle hiding in its shell.