Dragonlance, it was an idea by Tracy and Laura Hickman that became a D&D game at TSR. It ultimately went on to be adventure modules, books and even a movie.
Metagaming, we covered it. This is more meta terms the game master may use in a game. An example, “That’s a side quest, it’s not part of the main plot.”
“Your PC falls 120′ and suffers 60 points of damage”. No problem, I still have 60 left.
Sometimes it’s a small thing that throws us off, and sometimes it’s something bigger. What are the boundaries/levels of “Suspension of Disbelief” that we’ll put up with and where does it break, and ruin a game for us?