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1.
A celebrated time for potheads all around the USA (and possibly other countries) because it is believed that at 4:20, whether it be night or day, one should partake in the activity of smoking marijuana. It has practically made its self a holiday if you look at the date April 20th, which in months and days would be, in fact, Four Twenty.
Rejoice little potheads, for this might just someday be put on a calender expressly for the use of the 99 Cents store.
Bud: What time is it Mary-Jane?
Mary-Jane: *inhales* It's four twenty.
by Nameless Here Forevermore February 16, 2006
122 37
 
2.
The time of day when the whole world gets high, similar to the British tea-time.
Also rumored to be the police code for marijuana possession in many major police forces.
There is a famous clock in Cali. stuck on 4:20.
It's 4:20, do you know where your bong is?
by hiero1620 July 29, 2004
58 23
 
3.
A celebrated time for potheads all around the USA (and possibly other countries) because it is believed that at 4:20, whether it be night or day, one should partake in the activity of smoking marijuana. It has practically made its self a holiday if you look at the date April 20th, which in months and days would be, in fact, Four Twenty.
Rejoice little potheads, for this might just someday be put on a calender expressly for the use of the 99 Cents store.
Bud: What time is it Mary-Jane?
Mary-Jane: *inhales* It's four twenty.
by Nameless Here Forevermore February 14, 2006
48 34
 
4.
1. (n.) Synonym for Marijuana. Often used as a code so non marijuana users will not be aware that two users are discussing marijuana in public.

2. The time of day universally recognized for using marijuana. 4:20PM
1. "I moved into my apartment because my roommate was Four Twenty friendly"

2. "It was 4:19 just about that time." -ALO
by Mr. ForeTwenty September 13, 2011
10 4
 
5.
see definition for 4:20
four-twenty example can be found at 4:20 definition
by Thomas Watkins January 23, 2008
5 1
 
6.
Time of day to turn on music and get relaxed...; )
At fourtwenty, me and my friends were doing the same thing at the same time. Even if we were all at our own homes.
by sheila August 05, 2003
13 35
 
7.
It all started back in NoCal at a high school where estudiantes were looking for some buds that was s'posed to be on dis island, they all met at a flagpole at 420 to search fo da' buds nigga', ya heard me.
It's 420 bitch, come over here and suck daddy's diznick while I blaze this spliff...ho ass trick.
by k dubb May 07, 2004
20 154