In group presentations, it's the person who assembles the Power Point.
Usually done as an excuse to do less, or no actual work.
Doug: Ken, you do physical and chemical properties, and Rachel will do uses.
Ken: Okay, but what'll you do?
Doug: Ah, I'll do the Power Point, just email me all your work, right?
Ken (To Rachel): Dammit, Doug's just a lazy ass Power Pointer.