Orgininally used to classify the high-grade or potency of marijuana. Now, can be used as an adjective/noun to describe or denote anything possessing good qualities or leading to beneficial results. Short for and interchangable with chronic.
Man, I got some strawberry toaster struedles the other day; that shit was the CHRON.
Stacy has some huge tigs- putting it between 'em would be CHRON.