Flacas Vacas is an ironic comedy about unhealthy friendship among women. Olga, Teresa and Magdalena have been friends since they were born. After a few years of not seeing each other, a casual meeting leads to a weekend at the beach. Soon it becomes obvious that almost everything they used to share is long gone. To make things more awkward, Olga's crazy sister and her girlfriend show up and decide to stay with them. Everything is a disaster, and they all end wondering what it means to be friends.