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.
The Embarassed Turtle, the Bat Wing, and the Brain are some of my favorite penis molding techniques during boredom.
The act of having sexual intercourse, turtle style. This involves the woman bent over, with the man bent on top of her entering her from behind. It is best accompanied by high-pitched frightening moans coming from either person.
girl 1 "last night me and mike were dancing, and he bent over on top of me! It was so arousing!"
girl 2 "looks like it was your first time having turtle sex!"