Abstract. This article explores the development and evolution of slang, emphasizing its role in the dynamic nature of language and its reflection of societal and cultural changes. It examines how slang has emerged from subcultures, evolved over time, and adapted to technological advancements and social movements. The article highlights the factors influencing slang’s development, including social identity, creativity, and communication efficiency. Key examples illustrate how slang has shaped language, with terms like "cool" and "hangry" evolving from niche usage to mainstream acceptance. The article concludes by discussing the enduring nature of slang as a powerful tool for linguistic innovation and cultural expression.