420 rule 

the rule in which you can not consume marijuana in anyway before 4:20 pm and after 4:20 am.

Guy #1 - Yo lets go smoke some bud, dude.

Guy #2 - Nah man its only 2:20, we still got 2 hrs.

Guy #1 - Damnnn, you're right its the 420 rule

420 rule by realshitfaced August 14, 2010

Rule 420

Blaze it.

Rule 420 states: When the time is 4:20, regardless of AM or PM, one has to go wild.

Guy: Dude its 4:20
Guy 2: *Goes wild*

Rule 420 by PremierAlan December 4, 2016

Rule 420

Rule 420 states: When the time is 4:20, regardless of AM or PM, one has to go sicko mode.

Guy: Dude its 4:20 Rule 420
Guy 2:* proceeds to sicko mode*

Rule 420 by niggersarenotwelcome December 14, 2018

Rule 420

at 4:20 (PM or AM) one must smoke any marijuana substance available. (this includes, but is not limited to, eating, snorting, fucking, cooking, etc.)

Girl: hey what time is it?

Guy: its 4:20 PM

Girl: i think im gonna go outside and smoke a cigarette.

Guy: Rule 420 bitch!

Rule 420 by GANJAGANJ December 21, 2008