One of the terms that many seem to be seeing in personal ads and even sometimes a a text code is 420. Today it is generally used to signify illegal drug use or more specifically the use of marijuana. But where did the term come from.
According to snopes.com it started to be used by a group of students at San Rafael High School in California. The time, 4:20 in the afternoon, was the time that they would get together to smoke weed. This was way back in the early 1970s.
Also on snopes it is said not to have any relationship to police codes for marijuana use in progress.
The California Bill that legalized the use of medical marijuana is Senate Bill 420, but it was signed in 2004, long after the term was in use. Although I suppose some may have started using the bill number without realizing that the term was already being used by others.
4-20 is also April 20th, with April being the fourth month. And with this some groups have begun using this date as a counterculture holiday. One where people gather to celebrate and consume marijuana
April 20th is also the birthday of what many considered to be the most despised man in History. Adolf Hitler was born on April 20, 1889.