1.Breeding ground for crabs. (see pubic nit). See also Crab Ranch.
1.Dont ever go near anyone with a crab farm in their undies.
A person so infested with crabs that the crabs take up permanent residence on the person and begin farming said person's pubic region to counteract the rapid population growth.
Person One: Hey dude, that chicks got crabs.
Person Two: How bad?
Person One: She's a fuckin crab farm.