4/20 

The day after 4/19.

"What's todays date?"
"Well yesterday was 4/19, so today is 4/20."

4/20 by GLEAS01 April 13, 2009

4/20 

Hitler's Birthday. Also the day before the queen's birthday.

It's 4/20! HEIL HITLER!

4/20 by akaliiswaifu April 22, 2020

4/20 

The unsimplified version of 1/5 for a bunch of dumb asses who never passed elementary school math and subsequently never learned to reduce fractions.

Person 1: Hey, ready to celebrate 4/20?
Person 2: Actually, I will be celebrating 1/5, since it's the mathematical equivalent to 4/20.
Person 1: ...k...

4/20 by Mr. Guam April 20, 2015

4/20 

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)

4/20 by Litlock May 9, 2012

4/20 

Day of the Columbine High School tradgedy.

"hey isnt 4/20 weed smoking day?"
"no you ass its the day the columbine shootings happened"

4/20 by pppppeeeace May 6, 2006

4/20 

4/20 day is about the joy and the pleasure of smoking weed and getting high. But it’s actually two holidays. Second, holiday is when mothafuckers got they damn hat stumped off in the bush. So we are now calling 4/20 Weed day and he in tha bush day. THANK U PEOPLE!!

This is defined as 4/20 being bush day and weed day.

4/20 by Rello1500 April 22, 2019

4/20 

It’s like #dickdestroydecember but with cones, day one 1, 1 cone, day2, 2 cones and so on

Hey bro you doing #4/20 yeah bro can’t wait for 30 cones in one day!!!

4/20 by Raaaaa.com January 15, 2020