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know that you did something but dont know when you did it?

just use whenday
harry: oh i went to the waterpark
jacob: oh when
harry: whenday, im not sure
whenday by w1ll_ig June 17, 2023

SCP-001 "When Day Breaks" 

the sun is red, come out and see the sun. the surface is safe and everything is now beautiful
Guy 1: hey why is the sun red
Guy 2: oh it's SCP-001 "When Day Breaks"
Wednesday for idiot that can’t speak
Girl: how’s your wenday going?
Wenday by Dummiestdummy August 8, 2020

Whensday? 

Some day of the week or other, during Covid, when time is disordered.
The Zoom meeting is... Whensday? Or what.
Whensday? by Monkey's Dad August 26, 2020

National When Day 

To celebrate when i asked about a certain topic, subject or fact

National When Day: 10th November
Joe: Did you know that today is my grandma’s anniversary
Kyle: You know what day it is today?
Joe: My grandma’s anniversary...?
Kyle: No its National When Day
Kyle: When did i ask?
Joe: oh

whensday 

if you think that whensday is spelled wednesday your fucking stupid as hell. the true spelling is whensday dumbass
person 1: "man this wednesday is gonna be great"
person 2: "you.. believe in wednesday? its whensday you idiot!"
whensday by sandwich_maker January 13, 2020
More from Urban Dictionary

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
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
Literally "dirty" pronounced with a West Indian accent. Can also have a positive connotation, for example Sean Paul's album title "Dutty Rock".
"The girl is pretty but she corrupt and dutty!"

or, in a positive usage:

"Booya! That freestyle was dutty!"
Dutty by J Hall April 3, 2003
Word of the Day on October 1, 2026
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