Rotting by Green Day is a punk rock song that delves into themes of disillusionment, despair, and existential struggle. The song's lyrics convey a sense of decay and a loss of direction, reflecting the emotional and psychological turmoil of the protagonist. Key themes in the song include mental anguish, the search for meaning, and the inevitability of deterioration. Poignant moments include the vivid imagery of rotting and the raw portrayal of inner conflict. The song paints a grim picture of the human condition, evoking a powerful response from listeners.