420 (cannabis culture)
420 (pronounced four-twenty) is cannabis culture slang for cannabis consumption, especially smoking around the time 4:20 p.m., and annual cannabis-oriented celebrations, protests, and advocacy held on 4/20, the U.S. notation for April 20. == Origins == Five high school students in San Rafael, California, coined the term as part of their 1971 search for an abandoned cannabis crop, based on a treasure map made by the grower.