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4:20Four-twenty Commonly known as the time to smoke pot. It has come to mean everything from the act of smoking, the stuff that's smoked, and the optimum smoking time. Because 99% of today's culture DOESN'T know what 420 means, it has become a code people use to identify and talk with each other without outsiders knowing. Also known for the date, April 20th, which is the day to smoke pot all day, "the hippie holiday."