sibling crush

That one person that if they were your sibling, you would die of happiness.

1
•Girl: I am like- in love with Max Charles.
But like, not a romantic one.
I just want him as my brother.
•Boy: A sibling crush?

2
I have this mad sibling crush on Max Charles.

by Catch-My-Vibe June 27, 2016

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

Eldest sibling syndrome

Eldest sibling syndrome or E.S.S is When you are the eldest amongst your siblings so you automatically fall into the cycle of having to use things until they are disintegrating because you can't ask for new ones.

Whereas on the other hand any younger sibling can ask for whatever and get it instantaneously because they are not the eldest.

Examples of this include tattered clothes and using things until they break.

Person 1: Dude. Your underwear is literally hanging by the elastics. Why don't you get new ones?

Person 2: Oh you know why. Ask my little brother.

Person 1: No wait. Don't tell me you have Eldest Sibling Syndrome!?
Person 2: It's gotten worse

by Mad King JJ July 29, 2017

Grand siblings

When you have siblings with an 18+ year difference.

John: “My dad called me the other day and told me I’m about to have twin sisters. He’s 60 and I’m damn near 35!”
Jim: “You got grand siblings that’s crazy.”

by MelaNova July 16, 2023

full sibling

Person who has the same two parents in common with someone.

My full sibling is a good person.

by Mr. Jacov November 23, 2019

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

My Sibling in Gygax

A gender neutral, non-religious alternative to the phrase "My brother in Christ." It is used to address a person(s) who plays the table-top game Dungeons and Dragons (or enjoys other nerdy hobbies), which was co-created by Gary Gygax. As "My brother in Christ" has developed more nuances, this adoptive phrase has as well, and may not be intended as addressing someone who is acting in error or ignorance.

"This D-twenty is rolling shit tonight."
"My sibling in Gygax, throw the thing in Dice Jail."

by MDIAB March 27, 2024