The development of social media has transformed the use of Arabic among Generation Z through the emergence of new vocabulary and language mixing in digital communication. This study aimed to analyze the forms of Arabic lexical neologisms on social media and the patterns of language interference in the digital interactions of Generation Z in Metro City. This study employed a qualitative approach with a descriptive case study design. Data were collected through digital observation, semi-structured interviews, and documentation of social media interactions, and were analyzed through data reduction, categorization, interpretation, and conclusion drawing. The findings revealed that Arabic lexical neologisms emerged in the forms of new word formation, semantic shifts, morphological adaptation, abbreviation, and lexical innovation influenced by the characteristics of digital communication. Meanwhile, language interference occurred at the lexical, morphological, and syntactic levels through code-mixing and code-switching involving Arabic, Indonesian, and local languages. These phenomena indicate that social media has become a productive space for linguistic creativity and changes in the use of Arabic lexicon. Theoretically, this study contributes to the development of digital sociolinguistic studies of Arabic by demonstrating that neologism and language interference are adaptive processes that reflect language change and the construction of Generation Z identity in digital communication.
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