Language is ever-changing. Go read some original Shakespeare and see how much of it you understand. I mean, it's still English. Just not the version you or I are really used to. Groups in isolation tend to come up with their own words and phrases (aka - jargon) that mean very specific things to that group. Dialect is a roleplaying game that explores how language is created, how it grows, and how it can change everyday interactions. It's also up on Kickstarter now.
In the game, players will take on the roles of characters in some isolated environment. There will be certain aspects of the environment that will put pressure on the group and will help direct how people act. You'll then come up with words, including their etymology, and have conversations with the group using those words. Basically, you'll be creating jargon and showing how it's used and how it can even change over time.
The Kickstarter campaign is up and running now. They're, oh, about 35x their starting goal, with still 19 days left on the clock.