The song "O" by Rilaya talks about the struggles of love and the inability to find true happiness with someone. The lyrics describe the constant calls and meetings, the overwhelming kisses born from wild passion, and the feeling of being fed up with it all. The song emphasizes the idea that despite sharing the same pain, the characters cannot find joy together, and they cannot love anyone else. The lyrics express the longing and constant presence of the person in the singer's words, eyes, and heart. Overall, the song captures the complexity and confusion of love and relationships, and the struggle to find happiness and fulfillment.