Shoplifter by Green Day is a punk rock song that addresses themes of rebellion and anti-authoritarianism. The song tells the story of a young person who engages in shoplifting as an act of defiance against societal norms and the consumer culture. The repeated references to stealing and not conforming emphasize a sense of resistance against established order. The poignant moments in the song highlight the protagonist's sense of empowerment through actions considered illegal or unconventional, reflecting a deeper commentary on youth rebellion and the desire for personal freedom.