family slut

A slutty girl who is shared by brothers in off an on hook ups, or bounces back and forth from one to the other, making the brothers hate each other.

Guy 1: didn't she just date your brother?
Guy 2: Yeah, but we've been making out.
Guy 1: Dude, get rid of her, shes like your family slut.
Later that day, guy 2 gets his ass kicked by his older brother.

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