What does para eso están las amigas mean?
Expression
that's what friends are for
The standard formula for waving away a favour, just as in English. It is also misused on purpose: said in reply to an ironic gracias, straight after the least kind thing available, it turns a jab into a joke. Deploying a kind phrase in the least kind spot available is one of the most Spanish jokes there is.
—Gracias por quedarte con el perro. —Nada, para eso están las amigas.
