When you sneak up behind someone and cream in them before they know you were there
Damn, I was minding my own business when I look down a realize I had been ninja creamed! The nerve on that guy.
The act of filling ones vulnerable computer with the same JPG image many times over, often in multiple directories along with changing the background image.
My lord, I just caught Kobe Jpegging me last night, that was almost a disaster.