Learn the Dothraki Language
J Thoendell stashed this in Game of Thrones
The language (as it is today) is an expansion of the small bits of Dothraki found in the first three books of A Song of Ice and Fire. It’s now a fully-functional, human-usable language with a vocabulary of over 3,000 words (and growing).
For introductory information about the language, check out the following resources: