Saya tidak tahu... tapi saya mencari tahu dan akhirnya tahu...!
Ringkasan dari artikel yang saya baca kalau kamu terlalu malas membaca dalam bahasa Inggris, adalah :
420 adalah bahasa kode dari genk Waldo para pelajar SMA San Rafael pencinta ganja di tahun 1971.
420 adalah waktu, yakni pukul 4:20 pm atau 16:20.
420 adalah estimasi waktu berkumpul untuk mengganja yang tepat setelah pulang sekolah dan menyusuri taman untuk mencari tanaman ganja senior mereka yang tersembunyi (yang tak pernah mereka temukan) dan kembali berkumpul di patung Louis Pasteur.
Di San Fransisco dan Santa Cruz serta beberapa tempat lainnya, 420 telah dijadikan tanggal konsumsi ganja nasional (Setiap 20 April, pukul 16:20 atau 4:20 PM).
420 bukan kode polisi, bukan jumlah kandungan kimiawi ganja, juga sama sekali tidak berkaitan dengan perpasalan atau hukum ganja apalagi dengan waktu minum teh x_x == 420 murni bahasa kode/isyarat untuk waktunya mengganja dari geng Waldo para pelajar SMA itu.
So far the majority of you are incorrect.
420's origin IS known.
the term 420 originated at San Rafael High School, in 1971, among a group of about a dozen pot-smoking wiseacres who called themselves the Waldos, who are now pushing 50. The term was shorthand for the time of day the group would meet, at the campus statue of Louis Pasteur, to smoke pot. Intent on developing their own discreet language, they made 420 code for a time to get high, and its use spread among members of an entire generation.
So there ya go, someone's parents out there invented the term 4/20.
And remember this:
There are NOT 420 chemicals in Weed. It's about 315, the num. goes up or down depending on what you're smoking.
4/20 is NOT police code or Maryjane.
And that whole shit about Holland and 4/20 over there being "tea time" for smokers isn't true either.
To add to the definition regarding "The Waldos," I'd like to note that in an article of High Times containing an interview with the waldos, one of them told this story:
We had heard rumors that one of the members brothers had planted a pot patch in the wooded area around town. We all wanted to go look for this patch of weed, so we devised to meet eachother by the statue of Louis Pasteur after school. Since we all had after school activities or electives that lasted about fifty minutes, and since it took about ten minutes to get from school to our after school activities, and another ten minutes to walk from the activites to the statue. Since there were many of us we decided that 420 would be a good time to meet so we could go search for the patch of pot. We never did find it, but we had lots of fun getting high while trying to look for it.
Therefore, when they were at school, when they saw eachother between classes they would secretively say "420" and maybe give the thumb-and-pointer-finger-to-the-mouth sign to indicate that that was when they would meet to look for the weed patch. Since the waldos were such legendary potheads, when people who were not waldos saw this, it caught on and they assumed it was a secret code word for pot.
420, 4:20, or 4/20 (pronounced four-twenty) is a code-term that refers to the consumption of cannabis and by extension, as a way to identify oneself with cannabis subculture or simply cannabis itself. Observances based on the number 420 include smoking cannabis around the time 4:20 p.m. (with some sources also indicating 4:20 a.m.) on any given day, as well as smoking and celebrating cannabis on the date April 20 (4/20 in U.S. form).
A widely discussed story says that a group of teenagers in San Rafael, California, calling themselves the Waldos,because, "their chosen hang-out spot was a wall outside the school", used the term in connection with a fall 1971 plan to search for an abandoned cannabis crop that they had learned about. The Waldos designated the Louis Pasteurstatue on the grounds of San Rafael High School as their meeting place, and 4:20 p.m. as their meeting time. The Waldos referred to this plan with the phrase "4:20 Louis". Multiple failed attempts to find the crop eventually shortened their phrase to simply "4:20", which ultimately evolved into a codeword that the teens used to mean marijuana-smoking in general.Mike Edison says that Steve Hager of High Times was responsible for taking the story about the Waldos to "mind-boggling, cult like extremes" and "suppressing" all other stories about the origin of the term.
Hager wrote "Stoner Smart or Stoner Stupid?" in which he called for 4:20 p.m. to be the socially accepted hour of the day to consume cannabis. He attributes the early spread of the phrase to Grateful Dead followers, who were also linked to the city of San Rafael.