Imagine you're with a friend. You've crawled inside a bean bag chair and stood up, side by side. Now you try to walk through a door that's barely wide enough to fit through. The sides of the door jam keeping smooshing you together and you have to take little runs at it, one at a time.
Sounds pretty fun, right?
Oh, but also the bean bag smells like someone's sweaty fuckin' nuts.
Short Answer: They can't say much. Their only choice for communication is sending out an inappropriate surge/arc of seminal fluid.