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When two females have been intimate with the same male,
When two girls have had sex with the same guy
Girl 1: Omg i had a one night stand with Frank last night
Girl 2: seriously?! I did him last week! now we're igloo sisters!
by taylor077 October 14, 2013
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Two women who share a common male in their sexual history and are on good terms with one another. The female equivalent of "Eskimo Brothers."
Girl #1: How'd you get the store discount on that skirt?

Girl #2: Oh, the clerk and I are Igloo sisters. We both banged Craig.

Girl #1: Nice pull, lady! *fist bump followed by explosion*
by verbalfonders September 22, 2014
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