#420: why April 20 is celebrated as Weed Day
Those partial to the odd puff of a joint will know exactly why #420 is currently trending on Twitter — it's slang for dagga.
According to Time.com, this numerical nickname for Mary Jane dates back to the seventies when a group of American high school students would gather together at 4:20pm to smoke weed.
Why such a random time? It's when most of their extra murals would be finished, so they'd all be free to get high together.
To tip each other off about one of their marijuana meetings, they'd use the code word "420".
Since 420 also translates as 4/20 on the calendar, April 20 was declared Weed Day in cannabis culture.
While some people on social media are marking the date by lobbying for weed to be legalized, others are just enjoying the unofficial holiday by posting humorous tweets: