The day to smoke weed. It is based off of what police say when they see people doing drugs (“We have a 4/20 on…”).
It is celebrated internationally and people also wear green on that day. It is also Adolf Hitler’s birthday, and the date f the Columbine School shootings. Pronounced “four twenty.”
420, 4:20, or 4/20 (pronounced four-twenty) is a code-term used primarily in North America that refers to the consumption of cannabis and, by extension, a way to identify oneself with cannabis subculture. Observances based on the number 420 include smoking cannabis around the time 4:20 p.m. (with some sources also indicating 4:20am), as well as on the date April 20 (4/20 in American form).