Lunfardo is a unique slang that originated in the late 19th century in Buenos Aires, Argentina. It developed among the working-class immigrants and has roots in various languages, including Italian, Spanish, and Portuguese. Initially used by criminals, it has since become a part of everyday language in Argentina. Over time, Lunfardo has influenced Tango music and literature, enriching the cultural landscape of Argentina. Many Lunfardo terms have entered mainstream Spanish, making it an essential aspect of the country's linguistic identity. Today, it reflects the diverse heritage of Argentine society.