May 15 - Oldest Sibling Day

I do to much shit for these children so we oldest siblings get a holiday too. Shout out to that one tweet for the idea.

Youngest sibling- "Fuck you."
Oldest Sibling- "that's rude, judging its May 15 - Oldest Sibling Day"

by yourbasicbadbitch May 14, 2020

National Slap Your Siblings Day

A day where you get to slap your sibling(s) free of charge.

Active December 5th through 10th

Hey (Sibling) Its National Slap Your Siblings Day.

National Slap Your Siblings Day- A day where you get to slap your sibling(s) free of charge.

by otis wotis December 5, 2021

National Punch your siblings day

On March 19th The best holiday of all...

NATIONAL PUNCH YOUR SIBLINGS DAY!!
You get to punch your siblings all day with getting away with it.

Hey Bro I'ma punch you because its NATIONAL PUNCH YOUR SIBLINGS DAY!!

by qwq qwq qwq October 4, 2020

Slap your sibling across their face day!

On the 1st November, you can slap as little or as many of your siblings across their face

“Hey! It’s national slap your sibling across their face day!”

by Reetusthedinostomper October 26, 2019

Y.C.S.S. (Younger Cuter Sister/Sibling Syndrome)

When you have a younger sister/sibling that is better looking than you

Stacie is okay but have you seen her little sister Jessica? Stacie totally suffers from Y.C.S.S. (younger cuter sister/sibling syndrome)

by Discobeck August 28, 2018

Scare the crap out of your sibling day

October 31 is hollowenn so get something scarey on and scare the crap out of your sibling

If your an only child do what scares you before bed then go to sleep and it will be november 1st

GUY .Hey whats october 31

Other guy. holloween

guy. NOOOOOOOOOOOOOO ITS SCARE THE CRAP OUT OF YOUR SIBLING DAY ahhahahhahahahahha

by NOT AN ONLY CHILD October 31, 2019

national your little sibling sucks day

July 26th, national your little sibling sucks day. this is the one day of the year when your little sibling has to admit they suck. It's the law. they also HAVE to mean it.

My little sibling must now admit they suck because it is national your little sibling sucks day,

by Elia Al-Nims July 24, 2021