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13th December 

National male nipple day! Commemorate the male mammary glands by sucking a guy's nipple.
Alex:Bro, it's 13th december!!
Matt:And?
Alex:IT'S NATIONAL MALE NIPPLE DAY! Come on, give me that tiddy so i can give it a good suck, no homo
Matt:Fuck it why not. No homo
13th December by John Arbacle October 17, 2019

13th december 

People born on 13th december have fruity tookies
Her tookie do be kinda fruity doe
Duh nigga she born on the 13th December

13th December 

Fine line’s day OK? OK
Fine line (13th december) is the best album anyone has ever realised
13th December by Paula Serrano November 11, 2019

13th December 1907 

The Great Fall of 1907.
Shell: Why is Eileen so sad?
Dale: Its the 13th December 1907.
Shell: Oh.

13th of December 

13th of December, If you were born on this day you are the most hottest person in ir friend group. Everyone wants to be like you they just don't want to tell u thay talk about how pretty u are All the time
Ik why ...... is so hot she/he was born on the 13th of December
13th of December by anonymous November 4, 2020

December 13th 

The day where you have to pinch your shortest friend every time you see them.
Tall friend: Hey come over here! It's December 13th

Short friend: Oh noooooo....
More from Urban Dictionary
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
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