This study aims to describe the form and function of slang in the photo caption text of Lambe Turah's Instagram account on social media. The data collection method used in this study was the observation method with advanced techniques, namely the note taking technique. Methods of data analysis using intralingual and extralingual matching methods. The results of data analysis were presented using formal and informal methods. Based on the results of data analysis, it was found the form and function of slang in the caption text of Lambe Turah's Instagram account. The slang form of Lambe Turah includes the form of words, phrases, clauses and sentences. Lambe Turah slang functions consist of personal functions, directive functions, fatigue functions, referential functions, and imaginative functions.