This document defines and explains slang terms commonly used on the microblogging platform Tumblr. It provides over 30 terms with brief descriptions, such as "fandom" referring to a fan community for a show or creation, "GPOY" meaning a gratuitous picture of yourself, and "canon" being the original version of a show before fans add their own elements. The document aims to help readers understand the language used between Tumblr users.