The song "Say Something" by Karen Harding is about the frustration and confusion that comes with a lack of communication in a relationship. The narrator is feeling unsettled by their partner's silence and wants them to speak up and share what's on their mind. The lyrics reflect the narrator's impatience and longing for their partner to open up and express their thoughts and feelings. They are tired of guessing and want clear and direct communication. The repetition of the phrase "if you wanna say something, say it now" emphasizes the urgency and importance of honest conversation in maintaining a healthy relationship. The narrator also expresses their concern about their partner's actions, mentioning that they have been going out without explaining their whereabouts. This further adds to the narrator's unease and desire for clarity. Overall, the song conveys the frustration and longing caused by a lack of open communication in a relationship and advocates for addressing issues and sharing feelings openly and honestly.