This a term in "rider-ese" that indicates that the rider is asking for trouble. The horse is too powerful, has too much movement, not adequately trained ... the list goes on. When you are out-horsed, you feel like you are sitting on a powder keg of explosives, and someone has just lit the fuse. I've been there. My second horse was young, relatively untrained, had a lot of movement, and an attitude. I have the broken bones and scars to prove it!
I am feeling the same way about my new camera. I had been using my sister's [she of the Boxer fame] camera, and was happily plugging along. Then she needed it back to take photos of her new Boxer. I had to get a new camera. I couldn't really afford it, and it has functions that I will never use, but there it is - out-horsed again!
Complaints aside, it is a dream to use, but somehow I inadvertently pushed the wrong button, and I have been studying the manual, trying to figure out what I did, so I can re-set it.
Thank you for "listening". My grump is done.