Top Definition
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
by realshitfaced August 13, 2010
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