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

Belly Cousin by Flyboy87124 October 29, 2020

Third Cousin 

A cousin that shares a same pair of great great grandparents. Most people never met their third cousins. There’s plenty of people that never even met their second cousins.

I’m meeting my third cousin tomorrow who I’ve never even met before.

Third Cousin by AntiCircumcisionMan November 7, 2020

last cousin 

Having sexual intercourse with a long distant relative also known as a last cousin

(Lachy) my next door neighbour is hot but she is my last cousin

last cousin by Littlecrawbob02 February 13, 2021

co-cousin-in-law 

Spouse's cousin's spouse.

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

co-cousin-in-law by Gerald128 April 6, 2021

Eskimo Cousin 

When two people have sex with the same person but in different ways

Dude: yo I fucked Ryan in the ass last night

Dudette: that’s crazy Ryan fucked me in the cooter the other day
Dude: guess we Eskimo Cousins homie

Eskimo Cousin by Ball Bustin Bob April 13, 2021

half-cousin

Parent's half-sibling's child.

My half-cousin is a good person.

half-cousin by Usery May 2, 2021

half-cousin

Parent's half-sibling's child; the relative who has with the other person only one grandparent in common, but parents are different.

My half-cousin is a good person.

half-cousin by Usery May 2, 2021