This study investigates the impact of online chat language on second language learners and has gained significant attention in the field of language acquisition. The study examines how online chat language influences learners' proficiency, accuracy, vocabulary acquisition, and sociolinguistic competence. By analyzing relevant research studies conducted using the corpus-based methodology, the study aims to provide insights into the advantages and challenges associated with online chat language for second language acquisition. A sample of the corpus of online chat conversations via WhatsApp chat will be compiled, representing various language learners' interactions and finding out the KWIC through online software programmer Sketch Engine. The corpus analysis will be complemented questionnaire conducted with a subset of participants. The findings of this study will contribute to our understanding of the role of online chat language in second language acquisition and provide insights for language learners.