The article considers the significance of English-language borrowings in the development of the French youth argot which plays a crucial role in the non-format system. Members of the specified social group create a particular subculture trying to separate themselves from the representatives of other society strata by means of a specific sociolect, among other things. Using English words, the younger generation of the French assimilates them to create a subjective communication code with the help of word-formation techniques that operate on various language levels. The purpose of the research is to determine the main specific and non-specific mechanisms for the formation of new argotic units based on lexemes of English origin obtained by the continuous sampling method on the basis of linguo-stylistic (selection of vocabulary incorporated into the works by modern French writers and rap song scripts) and lexicological (analysis of scientific articles and argotographic sources) areas. The paper deals with the structure of modern French youth argot. The work gives the characteristics of the argotic functional features determining the variety of ways of word creation that cause linguistic isolation. The conducted analysis resulted in a classification of convergent models of neologization concerning the phonological, morphological and semantic linguistic levels. The relevance of the study of the modern youth sublanguage is explained by its intensive structural transformation, active replenishment and, in this connection, by the desire to analyze the communication environment of this reference group that has significantly expanded due to the Internet popularization and the variety of messengers, to understand its vocabulary repertoire and culture. For that reason we should note the necessity for further complex research of the processes occurring with the obtained non-conventional English-language lexical units in the speech of modern French youth.