Answer:
In my interpretation, when the narrator says, "It burns up your energy to holler," she means that calling out or shouting requires a lot of physical and emotional effort. The use of the word "burns" suggests that hollering not only consumes energy but also drains the person's vitality. This could be why the person in question is nicknamed "skeaky." It is possible that they are known for being soft-spoken or quiet, as they might choose to conserve their energy and avoid expending it on unnecessary loudness.