second great-great-cousin-aunt

Great-grandparent's female second cousin.

My second great-great-cousin-aunt is a good person.

first co-cousin-pibling-in-law

The child-in-law of one's grandparent-in-law's sibling.

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

sesqui-first great-cousin-aunt

Daughter of their great-grandparent’s half-sibling with the other great-grandparent’s full sibling.

My sesqui-first great-cousin-aunt is a good person.

sesterple-third-cousin

Sesterple-3C: Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents and five great-great-grandparents in common.

My sesterple-third-cousin is a good person.

Cousin Whitey

Powdered coke, or sometimes crank.

"I'm takin' my Cousin Whitey out to the club with us."

Cousin²

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 cousins²

Your cousins' non familial cousin is your cousin²

first cousin-niece

First cousin's daughter.

My first cousin-niece is a good girl.