The use of vocabulary items in speaking to other people in daily intercourse reflects the culture of the speakers of that language. The usage of slang words or rude-words in a communication with other people can be categorized into a bad communication. Nowadays, the use of rude words by teenagers with their peers in the daily conversation is a sign of a bad culture. Using rude-words especially in formal conversation is not polite; in addition the speakers who use the rude-words can also cause a bad image of the nation or the environment where the speakers live. In terms of the use of slang words, it is common for teenagers using slang words in every country in the world. But in every country, each language is different in its words' formation. The sources as well as the formations of such words are different from each country. This study uses a qualitative approach. The collected data in this research will be analyzed and reported descriptively. The data are encrypted from the audio-recorders, questionnaires, and also taken from the interview session. TO find all the data, the teenagers' dialogues among them are recorded by the speakers purposively.