They just write them down...
They don't make them up.
The people who put out the dictionary have really annoyed the folks at McDonald's. McDonald's anger over McJob entry Like many powerful marketers, they are confusing two things:
1. what people think
2. the truth as they see it.
If everyone thinks your ball bearings cause brake linings to seize up, then they do, regardless of what the truth of the matter is. The challenge of marketing is to get ideas to spread. 12 years ago, Douglas Coupland used the phrase "McJob" in his book Generation X because he knew everyone would understand what he meant. 12 years later, McDonald's is angry because it's "inaccurate." Of course it is! So what?