The aim of the research is to identify structural and functional features of linguacreative practices of modern digital subcultures that are formed in the conditions of hyperdynamic Internet communication. The material was a corpus of texts collected over the period 2021-2023 at the accounts of three subcultural communities of the Runet: ‘whitch-tok’, ‘alt-right edgelords’ and ‘koin’ speakers. The methods of corpus linguistics, discourse analysis and contextual interpretation were applied in the work with a focus on revealing the relationship between linguistic innovations and social functions of subcultures. The research results demonstrate that linguacreativity of digital communities is implemented through three key mechanisms: 1) hybridisation of archaic and innovative elements (resacralisation of terminology, algorithmic syntax), 2) formation of multi-level identification systems (cryptolalia, visual-text codes), 3) pragmatic adaptation to technological platforms (hashtag tagging, clip formats). It is found that these practices perform not only a communicative but also a forming function, making it possible for communities to construct alternative discursive realities. The conclusion emphasises that studying digital linguacreativity requires a revision of traditional linguistic paradigms in the context of network culture. The data obtained contribute to the development of medialinguistics and sociolinguistics, offering new approaches to analysing linguistic dynamics under conditions of digital transformation. The research prospects are related to studying the influence of artificial intelligence on the evolution of subcultural idiolects and their penetration into mass communication.