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K-day or kiloversary refers to the day when someone or something is an even multiple of 1000 days old. Such as: when someone is 35 years, 7 months and 3 days old they can celebrate their 13th k-day or kiloversary.
I used WolframAlpha to figure out what my k-day is.
k-day by the bromiester February 12, 2010
'K day' is an abbreviation of Christmas like 'x-mas' and there have been numerous suggestions as to its origin. Some theorists suggest it reflects the Eastern Jewish tradition against inscibing an X (the sign of the cross) in legal documents.
I think Tennesse are supposed to play K day.
k day by Bishop Saturday September 22, 2009
Used as a colloquial term when consuming the psychoactive substance Ketamine.

K-Days often evolve into urban safaris where K-9’s (see term) find their way to extraordinary adventures. When the K-Day peaks, our K-9’s achieve the ultimate harmony: their Chakras become aligned.

K- Days are every day and should be part of one’s daily routine.
“Hey, what day is it? It’s a fkn K-Day dude”

Everyday is a fkn K-Day dude”
K-Day by Daemonaise June 24, 2022

National K Day 

If you have a friend who name starts with a “K” you have to buy them something of their choice. You can’t say no. This day is October 4.
Kim: hey you know what day it is?
Ty: October 4th?

Kim: No it’s National K Day!!
National K Day by maRiklo October 2, 2021

International K-pop Day 

The International K-pop Day is on the 31th December and if you know a K-pop stan, you must do something fun and K-pop related with them, even if you aren't a K-pop fan. At exactly 23:59:13 you have to listen to 'Epiphany' so the first thing you hear on 1st January is "I'm the one I should love in this world."
K-pop stan: Hey! Let's go listen to K-pop since it's the International K-pop Day!!!
You: Alright but only because it is...

National F**k Xbox Day 

August 10th is the day to talk completely trash on xbox cause is dodo