6-21 

a simple code to express extreme displeasure with someone. Alphabetic code numbered 1 to 26. In this case the illustrious F-U.

6-21 former coach of the red and gold California football team.

Hey, criminal elected leader of the free world, 6-21!

6-21 by Imtalkinhere December 18, 2014

6-21 

When someone is being a cunt you can tell them 6-21. This is only to be used in a public setting where you can’t directly curse them out, and it stands for F-U, or (fuck you).

Person 1: Oh man it sure is great to see you!

Person 2: 6-21

6-21 by Ya boi Chris May 19, 2019

6/21 

national e621 day, where all the furries collectively browse e621 at around 2 am.

furry 1: "Its 6/21!! You know what that means..."
furry 2: OwO

6/21 by bedsbee June 21, 2021

6/21 

The furries si si no no day where they go on e621 and browse yiff

furry: the dates 6/21
furry 2: owo time for.. you know what ;)

6/21 by guy who likes to go camping June 23, 2022

6/21 

National Smoke Day. (Also known as the the Great American Smoke Out)

6/21 is the day you smoke all the Ganj you have.

Kid 1:6/21 is in two weeks!
Kid:2 Make sure we got lots of shit to smoke.

6/21 by Jae June 21, 2004

6:21 

A time for two funny memes which are 666 and 9+10=21 which is the perfect time to think of at 6:21.

I have parties, dates, calls, work at 6:21 everyday. It shows my love for my two favorite memes.

6:21 by Vagabro February 16, 2018

6/21 

National give sunsia a gift day.

Its 6/21 so give sunsia a gift.

6/21 by thedevilher December 8, 2021