first cousin-in-law

1. The child-in-law of one's parent's sibling.
2. The child of one's parent-in-law's sibling.

My first cousin-in-law is a good person.

by Elivaldeq November 24, 2019

15.5-tuple-fourth-cousin

15.5-tuple-4C: Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents, zero great-great-grandparents and thirty-one great-great-great-grandparents in common.

My 15.5-tuple-fourth-cousin is a good person.

by ABGR June 9, 2021

Cousin squared

Auntie Alpha and Uncle 1 have child ABC

ABC is your cousin
123 is the opposite family cousin

You have no direct relation to 123 beside being your cousin cousin
123 is a cousin squared

What do you call your cousin's cousin?

Cousin squared

by Condescending Loser April 17, 2024

flu cousin

When you and another guy get cheated on by the same girl but both of you already fucked her and you both have her AIDS.

Guy One:Dude,I can't believe she used us like that,and now I have AIDS from her.
Guy Two:Bro I got AIDS from her too!
Guy One:Holy moly that makes us flu cousins.
Guy Two:Man let's go somewhere to eat,my treat.

by Quantum Ranger September 20, 2015

cousin-niece

First cousin's daughter.

My cousin-niece is a good girl.

by Mr. Jacov November 23, 2019

5.5-tuple-fourth-cousin

5.5-tuple-4C: Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents, zero great-great-grandparents and eleven great-great-great-grandparents in common.

My 5.5-tuple-fourth-cousin is a good person.

by ABGR June 9, 2021

Cousin squared

Auntie Alpha and Uncle 1 have children A,B,C

A,B,C are your cousins
1,2,3 are their opposite family cousins

You have no direct relation to 1,2,3 beside being your cousins' cousins
1,2,3 are cousins squared (cousin²)

The non-related cousin of my cousin is my cousin squared

by Ms Ter March 26, 2024