Equestrian Dictionary is a tumblr compiling a variety of fanon terms that might be used within Equestria. Each entry includes a word, a part of speech, a definition, and an example sentence.
Many of the terms are sexual in nature, describing sexual orientations or activities among ponies. And some others are racial epithets applied by one pony type to another. But the blog is open to reader submissions of any type of word relevant to the world of Equestria.