The creative art of masturbating without the feeling in your arm or hand. The extremity has "fallen alseep" due to poor circulation in the arm. Ultimately the sensation is that of another person, since you cannot feel your own hand performing the act.
Bill decided to perform a Dead Charlie after his hand feel asleep and was overwhelmed with the false sensation of another person jacking him off.
When you kick someone so hard in the asshole, they actually shit their pants.
Oh man, that guy just gave me a Dead Charlie. Better go clean up...