Something very cool, as defined by StoosH, The StoosHMeister
(derived from Irkle which is cool in the male form and Firkle which is cool in the female. Combining the two makes it unisex and hence, more cool.

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.