8
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
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9
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
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10
The day after 4/19.
"What's todays date?"
"Well yesterday was 4/19, so today is 4/20."
by GLEAS01 April 12, 2009
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11
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
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12
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
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13
Day of the Columbine High School tradgedy.

"hey isnt 4/20 weed smoking day?"
"no you ass its the day the columbine shootings happened"
by pppppeeeace April 26, 2006
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14
2/10. or more properly 1/5.
"the answer is 4/20"
"dont you mean 1/5? idiot."
by glencorathecat April 20, 2005
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