What does 420 Stand For; 420 is a term that is often associated with cannabis culture. It is believed to have originated from a group of high school students in California who would meet at 4:20 pm to smoke marijuana. Over time, the term has become a code word for cannabis use and is often used by enthusiasts to refer to the drug or to indicate that they are using it. However, it is important to note that cannabis use is not legal in all jurisdictions and can have negative health effects.