couster


female cousin that is more like a sister
my cousins and sisters are so close we’re cousters.
one’s sister and cousin at the same time: the result of either a man producing two children with a set of sisters, or a woman producing two children with a set of brothers, making the female offspring a couster to the other child.
“carlie is my couster; we have the same dad but our moms are sisters. that is, like, so totally freaky!”

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