Sand Siblings 

The three children if the fouth Kazekage in the series Naruto. the youngest being Gaara, then Kankuro and finally Temari.

The sound 5 got pwned by the sand siblings

Sand Siblings by Twilightstarinthedarkfire March 12, 2010

GOD Siblings 

You're mom or dad's best friends kids.
Similar to a play cousin but usually a tighter bond. Would be blood siblings if your parents were blood siblings

Who is that? Oh those are my God Siblings, my mom and their mom are best friends.

GOD Siblings by JDD346 June 15, 2019

Older Siblings

People that are sooooo perfect and never start fights.

Yech. Older siblings. If only mom and dad could understand their bullshit.

Older Siblings by iTookAHarSHIT May 19, 2021

Slippery Siblings 

When a male and female have slept with the same female.

Person 1: Did you hear Halee and Louie both hooked up with Chrissy?
Person 2: Yea, they are defintley slippery siblings!

Slippery Siblings by DontAskDanny October 26, 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.

National Slap Your Siblings Day 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!!

National Punch your siblings day by qwq qwq qwq October 4, 2020

shit-siblings 

To become shit siblings, two people must each first take a shit, collect the shit and keep it in typical shit-form and then freeze the shits. After the shits are frozen thoroughly, the two parties will exchange their frozen shits, stuff their prospective shit-siblings' shit into their own asses and proceed to reheat and then re-excrete the the pre-fab log. They are now officially shit-siblings.

Who cares if you're blood brothers? Me and So-And-So are shit-siblings; way cooler, and way shittier. Ain't that some shit?!!!!

shit-siblings by wilbuey buhg August 25, 2010