The Brief: Eskimo brothers are two straight male friends who have had sex with the same woman.

DEEP DIVE
Similarly, the term Eskimo sisters refers to two female friends who have hooked up with or had sex with the same man.
The Brief: Eskimo brothers are two straight male friends who have had sex with the same woman.
Similarly, the term Eskimo sisters refers to two female friends who have hooked up with or had sex with the same man.