half-co-sibling-in-law

Spouse's half-sibling's spouse.

My half-co-sibling-in-law is a good person.

by Wonbig October 13, 2021

Homosexual youngest sibling

Your youngest sibling likes the same gender as themselves.

Ukiah is a homosexual youngest sibling because he has two older (straight) brothers and he likes dick

by Dnk pilot June 7, 2022

national throw your shortest sibling day

October 4th is National Throw Your Shortesd Sibling Day. If your shortest sibling really pissed you off today (like mine) you can now celebrate a national day and show them whos boss

come here jimmy, today is national throw your shortest sibling day!

by dinos_r_kool October 4, 2022

sibling law

When mom and dad refuse to get involved with sibling problems and the siblings take action

“I don’t care about that”
“Sibling Law is in place - everyone choose a side”
**group beating commenced until justices feels served**

by LGG000 October 20, 2019

surrogate older sibling

A person who fulfills the vacancy to be the surrogate older sibling in a family where the oldest child has left home whilst the younger sibling(s) are still too young to move out. Such vacancies are commonly found on the Happy Family sticker in the rear windshield of the family car. This role often involves providing guidance, support, and companionship in the absence of the biological older sibling.

After my older brother left home for college, someone became the surrogate older sibling, helping me navigate school and life at home.

by Emotional Cruiser September 29, 2025

Siblings

FUCKING DEMONS FROM HELL.

Person1: hey do you have siblings?
Person2:YES THEY ARE DEMONS FROM HELL.

by Nagitokomaedassult March 5, 2021

New Sibling

when you meet someone, who you get along with great, and you find out that you have the same names. a very rare coincidence.
usually between a guy and a girl who share names, (like sam, page, eric, jordan etc...)

person 1: man i've really been enjoying talking to you, but you still haven't told me your name.
person 2: ohh its sam.
person1: MINE TOO!!
person 2: you are totally my New Sibling!!!

by justin blue cheese December 22, 2008