Gutterspeak

Gutterspeak, also known as the Tongue of Thieves, is a pidgin that originated as a black market jargon and is popular among thieves' guilds. It is endorsed by the Forsaken as their official language, who've developed the language further into a creole.

Based mainly on High Common, the ancient mother tongue of mankind and the official language of the Kingdom of Lordaeron, it mixes in syntactic rules and morphological characterisitics of Dwarvish and Thalassian, making its grammatical structure messy and hard to understand for the untrained. The exact origins of the language is rather obscure as its speakers are usually secretive. However, most historians believe that the language originated during the Age of Enlightenment, in which increasing exchanges between the high elves and the Aeonics had urged a need for a market language to facilitate communication.