He's coming over," Lindsay says. "What do you want me to do? Kick him in the balls? I've been dying to kick him in the balls.
Lindsay informally tells someone that someone is arriving soon, indicating a sense of eagerness or anticipation. She seems to be addressing a situation involving this person and is possibly frustrated or joking about wanting to confront him physically.
Her comment about kicking him in the balls, expressed in a humorous and exaggerated manner, shows her frustration or strong feelings towards this person. The tone suggests playful sarcasm or a light-hearted attempt to cope with the situation in the context of the story.