Younger sibling

When you get a younger sibling, you have a 90% chance of the devil swapping it out with one of its minions. The other 10% of babies passed the devil's vibe check and was able to stay. These few specimens are the rare case of a well-behaved kid. If you have one, consider yourself lucky.

Kate: I have a younger sibling now!
Amy: so do I!
Kate: wtf you are my younger sibling
Amy: *sweats nervously*

Kate: The hell?! Mom! The baby's sweating, and its flooding the kitchen!

by Tired. Just. Tired. January 25, 2020

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

Sibling Ribaldry

When brothers and sisters are too close in inappropriate ways.

Terrance Magnumb had a case where a brother and sister loved each just too much and it created a sibling ribaldry.
(Excerpt from the book, Magnumb, Private eye)

by Magnumb,Private Eye February 12, 2022

bridge sibling

Your half sibling's, half sibling. When a child's parents seperate and go on to have other children, the relationship between those subsequent siblings. The original child acts as a 'bridge' between the two families.

This is Derek, my half-sister Mary's half brother. Mary and I share the same mother while Mary and Derek share the same father, he is my bridge sibling.

by GoJump April 25, 2016

Gallman siblings

The 2 awesomest people in the world!

Chris: Do you know the Gallman Siblings?
Tielor:F*ck yeah i do! Their the 2 awesomest people in the world!

by jbaby04 September 24, 2011

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

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.

by JDD346 June 15, 2019