Menu names
One product I worked on had a 'hidden' menu where we used to put new features. Product definition would eventually work out what to call it and where it would live in the product. In the meantime, QA would be able to get in some early testing. One of my friends added a new feature to this menu and notified QA that it was ready for some exploratory testing. He then got a lot of questions along the lines of: "Simon, what is a 'choad'?"