SUMMARY
The aim of this study is to determine the views of teachers and students about the teaching and learning of slang in teaching Turkish as a foreign language. The student-based working group of the study, using a screening model of quantitative research methods, is composed of B1, B2 and C1 level students who learn Turkish as a foreign language reached by means of easily accessible status sampling method of purposeful sampling methods and the teacher-based working group of the study, using a screening model of quantitative research methods, is composed of teachers reached by the same method. The data of the study were collected by two separate questionnaires prepared by the researchers to determine the opinions of teachers and students. Based on the findings of the study, it was concluded that the majority of teachers and students generally had a positive opinion about the learning and teaching of slang words in Turkish and it was concluded that the students wanted to learn slang words because of “better communication with the Turks”, “hearing too many slang words on the street”, “living in Turkey”, “being curious” and “just learning more words”. In addition to this result, teachers stated that this situation which students use without knowing the meaning of some words may cause problems in their social environment. For this reason, it is concluded from the teachers' opinions that either a separate book for the use of slang should be published or the other slang words except for swearword should be taught in the lessons.