A holiday self established by marijuana smokers that takes place on April 20th.

Originally started by a group of college kids who would meet at a statue everyday at 4:20 PM to smoke weed.

Some other drug usage may take place but marijuana is the main one.

Pronounced "four twenty", if you say, "four hundred twenty" you'll look like an idiot.
Me: My dad got so baked yesterday.
You: Why?
Me: It was 4/20.
by dotVillain April 21, 2009
The day to smoke weed... April 20th. Or every day at 4:20.
It's April 20th lets smoke an ounce
by Anonymous October 11, 2003
Hitler's birthday and the anniversary of Columbine. A lot of people smoke weed on 4/20, which is cool but other than that it doesn't look good on the planets reputation.
I'm gonna go smoke weed now.

4/20 is a very awesome day, as long as you're not a parent who's kid got killed at Columbine.
by jmann578 September 17, 2013
The day where a bunch of people go up to parliament hill (or they go anywhere) and smoke pot (weed) because the police can't get them in trouble because so many other people are doing it too! It's basically the one day that yu can smoke pot without getting into trouble...
Hey, it's 4/20, let's skip school and smoke some pot up on Parliment hill! (Ottawa)
by Litlock February 24, 2012
The day after 4/19.
"What's todays date?"
"Well yesterday was 4/19, so today is 4/20."
by GLEAS01 April 12, 2009
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."

Yo man, I got some fresh Columbian weed for us to smoke tomorrow... after all, it is 4/20.
by Jamesman9240 April 19, 2007
one of the most bullshistic "holidays" ever. Its the 20th day of April and is when a bunch of stoners get high.
its the gayest holiday ever because if you already get high every day then what the point? like celebrating the 4th of july so what is the fucking point of celebrating 4/20

stoner: heyy man tomorows 4/20 im so exited duhhhhhhh

regular person: wait are you high right now?

stoner: yeah duhhhhhhhhhhhhhhhhhhhhhh

regular person: wtf then whats the point? its like opening christmas presents early. its just messes up the whole feeling of the holiday.

stoner: hey look a bee duhhhhhhhhhhhhhhh
by heyy82 June 15, 2010
The word 4/20 comes from a couple of things firstly, a young man (greek) by the names kosta h(btw i hear his hot) or so not sure about his full name invented it by smoking tons of weed euuurddaaay at the same time he noticed a pattern in this. Everyday it would be at 4:20 after school... so from there he new he had to start calling it that. Secondly 4/20 is also a cops way of reporting that ppl are smoking weeed. thirdly, an event in amsterdam (weed capital) at the 4th month of the 20th day of the 4th hour of the 20th minute evryone in amsterdam would smoke the mary-jane.
"hey common lets go 4/20 (ppl dont noe wat it is so lets call it that and wont get caught XD)"
" we have a 4/20 in progress at jane and finch"
by "DA BOSS" April 21, 2009

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