this is a new one for me
2. Thunderous, noisy, stunning.
The Latin word for "lightning" is fulgur, which gave us the French synonym foudre, as well as foudroyant -- literally, "striking with (or like) lightning." (Foudroyant is also used in medicine to describe a disease that strikes with sudden severity.)
"Well, I have absolutely no idea what that halftime extravaganza was all about--but you have to admit it certainly was foudroyant."