The song 'The Grouch' by Green Day comes from their album 'Nimrod.' It discusses the theme of growing up and becoming disillusioned with adult responsibilities and societal expectations. The lyrics talk about a character who has become cynical, grumpy, and dissatisfied with life as they age, embodying the archetypal 'grouch.' It delves into how the pressures and monotony of life have stripped away the individual's youthful optimism. Key moments in the song include references to hating everything around them and the feeling of becoming someone they never wanted to be. It's a raw and honest look at the darker side of getting older and feeling trapped in a cycle of negativity.