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12.
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
318 333
 
1.
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
1416 385
 
2.
1) Adolf Hitlers Day of birth.

2) Smoking Holiday (4/20 any year)

3) Rumored Some college students would smoke everyday at 4:20 pm
My PC clock says 4:20 haha.
by BObo D. HObo July 22, 2004
1005 590
 
3.
April 20th; A day where actual cannabis-smokers do the ganja. Also the day where a bunch of poseurs claim that they're gonna smoke weed on that day to try to be cool, but really don't.
So, I don't do marijuana on 4/20. Fuckin' sue me.
by Mike of the Narkotics. July 11, 2008
525 374
 
4.
my favorite holiday
Unlike the holiday season, jews and christians alike all get together to smoke up on 4/20.
by Buffalo billy bobb July 08, 2009
336 280
 
5.
1. Natioinal Smoke Marijuana Day.
2. Hitler's Birthday.
1. Stoner 1: Hey man it's 4/20! We finna get high as hell!
Stoner 2: Fasho!

2. Happy Birthday Hitler?
by cubear69 April 27, 2009
180 152
 
6.
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
181 164
 
7.
a TIME in the 70's where a group of teens would gather after school got out to smoke marijuana. 4:20 was the perfect time because it was after school, enough time to get the weed and smoke before parents got home. since then april 20th has become a "holiday" in which people celebrate smoking marijuana! also, 420 is NOT a police number and they do NOT say that when they see people doing drugs.
"you wana get high? afterall it is 4/20."

"happy holidays, its 4/20"
by wallyworld girl April 20, 2010
85 76