Scumbag by Green Day delves into themes of frustration and betrayal, with the lyrics addressing a person who has wronged the narrator. The song portrays a sense of disillusionment with someone who has failed to live up to expectations, resulting in feelings of anger and disappointment. Key themes include betrayal, anger, and the consequences of breaking trust. Poignant moments in the song capture the emotional intensity of feeling let down by someone close. The raw, punk-infused energy of the track underscores the visceral reactions to betrayal and loss.