a cousin fucker is someone who fucks their cousin
You:Dora the explorer is a cousin fucker.
Someone: With Diego?...
You:Yeah...
Sesquaple-2C: Person who, in relation to the other person, has zero parents, zero grandparents and seven great-grandparents in common.
My sesquaple-second-cousin is a good person.
Daughter of their maternal first cousin with the paternal first cousin or double-first cousin’s daughter.
My double-first cousin-niece is a good person.