1. When a man with a extremely sharp erect penis shoves his penis in too quickly into the vagina and it rips the insides and exits out the asshole. Its extremely painful.... trust me. lol jkjk
2. When 2 men preform sexual intercourse with a woman. One man gets the asshole, while the other gets the vagina. On rare occasions, 2 men will shove their dicks in the same hole.
The man preformed double penetration on the manican because he was a very lonely man and no one on e-harmony was down to have some hardcore double penetration sex with him.