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A woman who has shared a sexual partner with another person and the two are on friendly terms. In today's day and age, the eskimo sibling could be a male or another female...you just never know.
Jenna: "Hey do you see that girl with the tramp stamp? I totally did her last week at Michelle's party."

Brad: "What? I was inside her the night before. Give me a high five. You're my eskimo sister!
by EskimoSibling January 11, 2012
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A girl that has fucked your eskimo brother but not you
Bro, I was about to get with this chick but she fucked Chad.

Dude, never fuck your eskimo sister in laws. That's almost incest.
by Callmedad42 July 22, 2017
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french eskimo sister

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When two eskimo sisters elivate their siserhood with an aerial position of both women riding the same man on his face and cock respectively and the joining of hands.
"That time Marilyn Monroe and Jackie Kennedy slept together with JFK, they totally became French Eskimo sisters. They even high - fived."
by AylaDilara April 28, 2014
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Two women who have slept with the same man in their past.
Judy and Gail were Eskimo sisters since they both went to bed with Ronnie during their freshman year.
by Joe Corey February 14, 2004
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Two females that have had sexual intercourse with the same person.
"Dude you fucked Jacob too?! We're eskimo sisters!" :D
by bricmeow August 14, 2011
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