Having sex with a female or male that a friend or someone you know has also had sex with.
Person 1: Aw man I was so hammered last night I slept with John Doe's ex girl friend.
Person 2: Damn, now you're John's ghost cousin.
by Fu man chu July 8, 2009
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The spirit of Listerine, moon beans and the great buffalo. They're always around you, though only noticed by those with a mustache. They provide great fortune to true believers.
We lost my sisters goat one time but then the Ghost cousins came and were like "hey, look to the Long House and you will find your sisters goat." Then what'd you know, we believed in the ghost cousins and there it was, right by the Long house.
by Straight Cousin December 23, 2013
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