A method of war in which a person initiates in the act of charging into battle screaming the name of Jack Dark. This method is very ineffective and normally results in death for all.
When an individual, usually a guy, will get soooo into a masturbation session that they'll get completely naked, touch their bunghole, and even rub their own nipples. They might even have sex with a couple of pillows or cushions to simulate a real sex experience.
"Dude, I'm going to go and jack-off. Wait, I think I'm due for a sexy-time jack-off. I'm excited!"