Posted in Internet Slang, Organizations DIIN stands for Damned If I Know DIIN stands for Dyslexia Institute of Indiana (Indianapolis, IN) DIIN Share Pinterest Tweet Whatsapp Post navigation ACISDIIOP Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.