The study analysed The Style of Kiswahili Slang Used on Instagram. Specifically, the study concentrated on two objectives which were to identify instances of linguistic manipulation in Kiswahili slangs on Instagram and to identify the linguistic reasons for using Kiswahili slangs on Instagram. The study employed a qualitative approach and the data was collected through textual analysis, questionnaire and Focus Group Discussion to obtain the data and from 20 active informants who were sampled through purposive sampling. The study employed Communication Accommodation Theory that was developed by Giles and Ogay in 1971 and Stylistic Theory for data analysis and presentation. The findings of the study discovered that Kiswahili slang are manipulated through morphological, syntactic, semantic and paragmatic manipulation which creates compounding, clipping, neologism, borrowing and loanwords, sentence, idiomatic expresions, metaphors and abbreviations.. Moreover, the study revealed that the use of Kiswahili slang on Instagram was influenced by word economy, for in-group communication, for trending factor and euphemism. Slang as an informal language that most of people often use on different circumstances it should apprehend that the use of Kiswahili slang by instagramer users is motived by different reasons, so it is healthy to understand all these motives and work on them. Therefore, this study proposes that more studies should be conducted on Kiswahili slang on other other aspects of language.