I did a barrel roll (or canopy roll, both would appear to be accurate descriptions of the basic maneuver performed), and there was a large amount of displacement.
After a quick look around, there is no specific name for such a maneuver in which the original heading is maintained. Thus the term "high displacement barrel roll" would be accurate if positive g's were being pulled.
Now, the definition of inverted is "put upside down or in the opposite position, order, or arrangement.". And what I did was the mirror image of a high displacement barrel roll, only with negative g's. Thus the term "inverted" is, if not perfectly fitting, then at least quite close.
There was no ACM pre-established ACM term to describe what I was trying to describe. That is a fact. And because I said "inverted" instead of "negative-g", Feind got upset.
The implication was that I was trying to sound more knowledgeable than I am, and that I was intentionally just making up terms willy nilly. That is unnecessary, and frankly not becoming of a trainer.