December 1st 

This is the day to send a nude to your fellow soldier that has just completed No Nut November. This is the first time your soldier will have nutted in a whole month so make sure your have the most prime picture possible.

Dude! I can’t wait until December 1st because that’s when I can finally bust!

December 1st by Jimmony Crickets November 3, 2019

December 2 

December 2 is national ditch school day

The day were you can purposely ditch school and it would be okay

Teacher: why was everyone absent yesterday

Student: it was December 2

December 2 by - Urban_dictionary- October 30, 2019

Alex December 

One of two vocalists in the metal band, Forgetting Skaro. Alex is a young musician from Sydney, Australia, described as one of the best low-toned vocalists of the year.

"I wonder how Alex December managed to become so skilled at such a young age."

Alex December by corvoisbadasslol October 24, 2012

4th December the gay day

Be as gay as you want with any boy without saying no homo. It is not gay. You can even touch tips

Callum: Can I slip my dick in your ass.
James: no I'm not gay
Callum: it's the 4th December the gay day so it's not gay
James: oh ok stick if in as far as you want

4th December the gay day by England_sex December 3, 2020

December 1 

This is the day to send a nude to your fellow soldier that has just completed No Nut November. This is the first time your soldier will have nutted in a whole month so make sure you have the most prime picture possible.

Dude! I can’t wait until December 1st because that’s when I can finally bust!

December 1 by Jimmony Crickets May 28, 2020

December 6 

national tell your best friend you love them day

the day that didnt have a definition until i made one :(

me: hey best friend i love you!
best friend: i love you too, why are you saying it tho
me: because its december 6th!

December 6 by yeetthatfeetus November 10, 2019

December 19 1999

UrbanDictionary's birthday

"o.g" and "player " were posted by the user bob and alpha mu, on December 19 1999, making them the first UrbanDictionary entries. (I'm counting that as UrbanDictionary's birthday)

December 19 1999 by cinimodde November 28, 2017