Oil Siblings

Special bond between a guy and a girl created after both of them have had, alternatively or simultaneously, sexual intercourse with the same girl.

-Hey, Monica, guess who I tapped last night!

-Who?
-Jessica!
-No way, I did her last month. We're oil siblings!

by Oyster Lover February 1, 2016

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three-quarter-sibling

1- First cousin and half-sibling at the same time.
2- Child of mother and of uncle (father's brother) at the same time.
3- Child of father and of aunt (mother's sister) at the same time.

Three-quarter-sibling.

by Jazigurn October 28, 2024

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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

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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

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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

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