By Keefer Apr 20, 2021 1971 - Five friends at San Rafael High School in California coined the term "4:20" as a euphemism for smoking pot. April 20 became a popular day to spark one up, as did 4:20 p.m. Note that the Boston song, "Smokin'," clocks in at 4 minutes, 20 seconds, and if you multiply the title numbers in Bob Dylan's "Rainy Day Women," No. 12 and No. 35, you get 420. In perhaps the most fitting commemoration of the number 420, legendary stoners Snoop Dogg (whose "Up In Smoke Tour" ended on 4/20/2000) and Willie Nelson record the song "Roll Me Up and Smoke Me When I Die" on 4/20/2009, in - where else? - Amsterdam.