In this research paper, the author studied the English youth slang language. The subject of the study is a number of difficulties in identifying patterns and factors contributing to the updating and subsequent classification of the slang vocabulary. The research material was based on popular slang units proposed by ChatGPT. The objective existence of this phenomenon is in little doubt, but its characteristics are characterized by instability and dynamism. There is a gradual blurring of the boundaries of the literary and linguistic norm, which is accompanied by the active penetration of slang elements into various functional styles. Since slang does not fit into the traditional structure of the book language, this causes certain difficulties in its use and linguistic interpretation. Based on foreign literature, four factors and eight sources of the appearance of the replenishment of the vocabulary of youth slang in English were identified. In a comprehensive and detailed description, methods of theoretical research were used, contextual analysis: analysis of usage on platforms, etymological analysis: tracing origin, classification of mechanisms (by types of word formation and source), comparative analysis: usage in similar communities of different countries. The novelty of the research lies in a comprehensive approach to studying not only the structural and semantic characteristics of slang, but also the socio-cultural factors that determine its dynamics. The article is of interest for a deeper understanding of the linguistic creativity of young people, and may also help clarify theoretical ideas about ways to replenish the vocabulary of the English language in the digital age. The study of these processes not only enriches our understanding of language, but also allows us to trace the profound socio-cultural changes reflected in the daily speech of young people.