A self-indulgent, self-pleasing and over-the-top use of graphical elements made famous by Edward Tufte, such as sparklines, small multiples, and layering one prominent color over black and white.
The sort of activity that some designers do when they want to show off.
-What's with all the frickin' sparklines? Is that really necessary?
-Of course not. The designer just had a case of Tufteturbation.