The song "Someday" by Joan Jett and The Blackhearts is a defiant anthem where the protagonist expresses their determination to stand up for themselves and break free from a toxic relationship. The lyrics convey a sense of frustration and resentment towards the person they are addressing. The protagonist indicates that their love interest mistreats them and fails to show them respect. They acknowledge that despite this mistreatment, they have remained loyal and stuck around. However, the protagonist is confident that someday they will no longer tolerate being treated poorly. They vow to confront their love interest before they can even begin to hurt them again. The lyrics suggest a desire to take vengeance and cause pain in return, as they claim they will tear their love interest's heart apart. The song also contains strong language and explicit anger towards the person addressed, referring to them as a "son of a bitch" and expressing delight in the idea of them begging for forgiveness in the future. The protagonist declares their intention to reject them and find satisfaction in their own freedom and empowerment. Overall, "Someday" expresses a message of empowerment and resolves to overcome a toxic relationship, highlighting the protagonist's determination to prioritize their own well-being and happiness.