I think it means he is frightened
He is warning you that he is mad or does not like what ur doing he will use this as a warning if he is going to bit or kick or something else so take precaution give him a carrot so he sees u as a positive reanforcement (dont hand feed him he could remember when u had a carrot in ur hand a bit ur hand thinking theres a carrot there)
If a horse's ears are simply slanted backward they are usually "listening" to the rider; however if they are pinned to the head (you wouldn't even see them from a distance) the horse is angry.
Listening and / or Paying attention to you
Well if a horses ears are laid back, that means a horse feels scared or threatened.
If both of a horses ears are pinned down backwards against his head, watch out! This means the horse is angry or very irratated and he is likely to attempt a kick or bite.
That the horse is irritated and rather Angry. If the teeth are showing, the horse is in defense-mode. I.e Is warning you to back off.
ambut
When a horse puts both ears backward he is most likely upset or annoyed with something. This doesn't necessarily mean he will do anything bad, but use caution when approaching a horse with his ears back. He may try to kick or even bite if he feels threatened. If you are riding a horse with his ears back, try to calm him down by patting his neck. If just one ear is slanted back, he is probably trying to figure out your riding cues.
If they are flat on the horses head the horse is mad. If it not flat, the ear is just a bit turned around when your riding, good. The horse is listening. If your just by your horse and you notice the ear is like that, and it is slanting here and there but not flat, it hears something. If it is flat, then not flat, then flat again, the horse is mad and it hears something, OR it hears something the horse doesn't like
They are probably mad or ticked off about something. Or, they may be tired of doing something. If something is in their face and they slant their ears back, they are just being normal. A dogdoes the same thing when you get in their face. Either that, or they bite you.
Ouch!
It's called a bridlepath. Or if you mean shaving the mane, it means to 'hogg' the mane.
It is a sign it is annoyed or unhappy get him/her cheeked out by a vet