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When you forget to get weed for the actual 4/20, and can't find any because everyone is using theirs, or you are otherwise unable to celebrate on the actual day. So you therefore celebrate the day after...4/21
Sarah: Hey, do you have any weed?

Megan: No, and I can't find any from anyone else!

Sarah: Damn... 4/21?
4/21 by classy pseudonym April 20, 2010
Used to describe a hangover from marijuana.
"What's up with you man?"
"Nothin, I'm just totally 4/21 right now"
4/21 by Mr. Washable December 9, 2008
4/20: amazing day where everyone is hella fucked up all day.
4/21: the day after when everyone is too hungover to do anything and wishes it was 4/20 again
Today's 4/21 that means it's national drug test day because yesterday was 4/20
4/21 by Jay_jr99 June 3, 2016
The day to smoke paper... April 21st. Or every day at 4:21
Aye say Jay J , It’s 4/21, u got the printer paper or the brown paper bag to smoke?
4/21 by jayjgreen April 20, 2021
September 4th, 2021

Also known as Pac 12 North implosion day
Oh yeah I remember when 83% of the pac 12 north lost on 9/4/21!
9/4/21 by Pac12chatmember September 5, 2021