The act of being addicted to the best band of any kind ever created, the one and only Metallica.

Metallica Members are/were James Hetfield(Vocals Rhythm Guitarist), Lars Ulrich(Drummer), Dave Mustaine(Original Lead Guitarist), Kirk Hammett(New Lead Guitarist), Cliff Burton(original Bassist), Jason Newstead(Replaced Burton When Burton Died), And Robert Trujillo(Current Bassist).

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.