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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
Related Words
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

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 42068 

If it is in any way, shape, or form in Fortnite the entirety of Reddit will search day and night without rest for something else that also contains it, and has arrived prior to 2017, then claim that Fortnite plagiarized it.
Some guy:Hey look Fortnite copied water from Real Life!

Another person:Hey look, Rule 42068 is in effect isn’t it?
Rule 42068 by Vortex7523 January 4, 2021

Rule42069 

pull this out when you give someone a compliment and they reply with no u, uno reverse, or simply just disagree, this will counter whatever they have said and they are forced by law to accept your compliment or receive the death sentence.
"You look really good today"
"Uno reverse!!!"
"HAHA REMEMBER Rule42069"
Rule42069 by hsiwienfwofn October 1, 2020