Looking at something/someone you're familiar with, but having a memory of it, and no recollection of it. Everyone you know is somehow a bit of a stranger, and everything is new - but at the same time, you know it's jamais vu. Extremely confusing, and frustrating.

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.