Fake Cousin 

A term used to describe a relationship based on falseness. Sometimes referred to as FC.

Dat dude wants to be related to me so I call him my 'Fake Cousin' or 'FC'.

Fake Cousin by Denmaniac January 5, 2009

fake cousin 

someone who you would consider like a cousin to you, but they aren’t related to you. this “fake cousin” is often friends with your cousins as well.

friend: who is that in your family picture?
you: oh, that is ______, my fake cousin!

fake cousin by 0liviaS November 19, 2018