Belly Cousin

Male friend who have had sex with the same female. Similar to "tunnel buddy"

Mike: I had sex with Alyssa last night.

Jon: Oh, shit! I used to hit that also! We're belly cousins!

Both: *high five

sixth-cousin-8X-removed

Sixth-cousin-eight-times-removed (6C8R).

My sixth-cousin-8X-removed is a good person.

irregular-triple-fourth-cousin

Someone who, in relation to others, has zero parents, zero grandparents, zero great-grandparents, zero great-great-grandparents and five great-great-great-grandparents in common.

Irregular-triple-fourth-cousin.

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.