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1. Eskimo Cousin
A guy who is Eskimo Brother's with someone that you are Eskimo Brother's with, but not for the same girl.
"Hey, you're Eskimo Brother's with Mikey? I'm Eskimo Brother's with Mikey! That means we're Eskimo Cousins! Fack yeah!"
2. Eskimo Cousin
When two or more girls (or guys) find out the same girl (or guy) had sex with their significant others.
Lindsey's boyfriend slept with Summer, and my boyfriend slept with Summer too! Lindsey and I are now Eskimo cousins.
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