The purpose of this study is to describe the code-mixing in the South Jakarta language. This research is important to do because it is to find out whether the South Jakarta language has an effect on Indonesian. This study also aims to determine whether the South Jakarta language can cause the South Jakarta language to fade. The method of this research is descriptive qualitative. The data source of this research is the tiktok account @podcasekeselaje, this research also takes supporting data such as articles, journals, and the internet. This study also uses the listening method because in the process of collecting data the researchers listened to a video from account tiktik @podcasekeselaje. South Jakarta language is a language that emerged as a result of the times and technological advances, this language is a mixed code between Indonesian and English. Code mixing is not only used by the community, especially by young people. South Jakarta language has a positive impact and there are also negative impacts. South Jakarta language can add new vocabulary for the people who use it, besides that this language can also increase the ability of speaking English of speakers. However, this language also has a negative impact if it is used by minors and has not fully understood the meaning and method of using the language. South Jakarta language is interesting to study because it is widely used among the community, especially young people, recently the South Jakarta language is being viral through social media tiktok. This language is quite interesting because there is an element of code mixing in it. South Jakarta language is a new phenomenon that exists in society so it is interesting to study.