semen sibling

When you discover that one of your parents has had sex with the parents of someone you know, that person is now your semen sibling.

I kept wondering why dad keeps on giving rachel wierd looks, turns out he fucked her mother and we're semen siblings.

by Shalmanese October 21, 2006

Siblinghood

A Brotherhood as well as a Sisterhood

The Siblinghood of the Adjoined Orbs is so called because we are ancient and we are modern, we are witch and we are warlock, we are one with eachother and we will not be defined by you and your society

by Don D Phlots March 24, 2010

siblings

little shitesss who ruin your life

ugh I have to babysit my siblings who are little shitesss

by de dumb bitch October 4, 2019

National slap your sibling day

When it hits the 16th of November, don't forget about "National Slap Your Sibling Day".

Stepsiblings included.
Have a slapping time on the 16th! A day to mark in your calendar.

"Ow, why did you hit me?"
"It's National Slap Your Sibling Day!"

by UrbanWriter123 November 16, 2021

National slap your siblings day

December 18th its National slap your siblings day whether you have one sibling or 5 and your parents can get mad about it!

Mom:WHY DID YOU SLAP *insert siblings name*

Child: It's December 18th, National slap your siblings day

Mom: What-

by Gachafro December 6, 2021

siblingist

To be unfair or bias against a certain sibling.

Your being siblingist against your brother/sister.

by lannan.7 October 15, 2019

siebelink

A person who loves Shrek a lot. Will do anything to watch shrek.

The Siebelink couldn’t wait for the Shrek 5 movie

by Silversack August 23, 2021