The development of information technology is overgrowing. It has affected the development of many new languages and terms that emerged in the community. That new word term is jargon. In the analysis of the jargon word, many researchers have done it with a variety of differences, including the objective, methods, and media they used. In previous studies, some researchers examined jargon words in the film, stand-up comedy, classroom, and others. This research deal with jargon word in online shop. This research aimed to discussthetype of word-formation process of jargon words used in the online shop. This research is based on Yule’s theory.This research used qualitative research. The instrument of this research is observation dan documentation. In data collection, the writer took the jargon word in Instagram that is the caption of @E-fabric account. This research uses Simak method of collecting data and Catattechnique for rewrites or takes notes to find the word formation process in the caption @E-fabric account.This research uses Agihmethod and uses several techniques. The data shows that borrowing is the most common way to form words in the word jargon used in @E-fabric accounts. There are 21jargon terms by having 50% of all total word-formation processes. Meanwhile, there are jargon terms that include forming other types of words as well. Namelycompounding 19%, clipping 5%, acronyms 14%, prefixes, and suffixes 12%.The implication of this research to enrich vocabulary, especially in learning about advertisements. Teachers can implement this material to students when they are ready to teach the core activities of 3.4 and 4.5 about written text advertising goods, services and activities(event) in the mass media