You may well have seen it, but it may have been someone's coinage

It may, indeed, be someone else's coinage, Father Steve, but that does not devalue the coinage, nor your appreciation of it, the highest expression of which is to make actual use of the coinage in an informed context ... which you did!

I like "animositous" myself. It does fill a vaccuum. "Bellicose" does not quite cover the territory. And "animositous" invites favorable comparison with "impetuous".

Someone* said famously that, next in stature to the originator of a quote, is the person who uses it wisely. Ditto a coinage.

Ah ha! That someone is Ralph Waldo Emerson:

* Next to the originator of a good sentence is the first quoter of it. Ralph Waldo Emerson (1803 - 1882), Letters and Social Aims (Quotation and Originality)