vigorous shaking of the ass-cheeks to where it looks as if the ground may be vibrating due to sudden technonic plate movement as in the case of an impending volcanic eruption.

Adj. Something that is expected to have a long lifespan by virtue of having existed for a long time, based on the lindy effect, named for the New York restaurant Lindy's, coined by Albert Goldman and popularized by Nassim Taleb.