RPGMemes

they clack together two halves of split open coconuts to confuse the enemy

Maybe they Naruto run while galloping

They hold a polearm. Always.

With the whole upper half bobbing up/down like a horse nodding it's head while it runs.

Hold a shield and spear or somethin like that maybe?

I have visual references

Spank the butt

One hand scrolls through tiktok and the other holds an iced coffee, just like humans do while driving a car.

They shoot you with their bow.

They cross their arms since they also don't know what to do with them.

They place them majestically on their hips, as if they're the captain of a boat.

Does no one watch Xena anymore?

Naruto run.

they actually just bend down and use the human arms to help walk (more legs = faster, since less time without touching ground, more time propelling themselves forward)

or

Just windmilling their fists like wrecking balls.

Random, but I've just now realised centaurs can't shake hands with the milkman.

If you'd imagine how much something like a centaur would need to eat, they'd probably carry snacks.

In all the media I've seen the arms basically just stay in place, half bent.

This is just another reminder how weird a centaur is as a concept. Vertebrates don't have more than 4 limbs. Land vertebrates mostly have 4 legs, but the structure of their forelegs is very similar to human arms and wrists. Bats have wings, but their wings are basically arms with a membrane of skin between the bones. Even a Naga (human / snake hybrid) makes more sense than a centaur.

Also, think how unbalanced a centaur would be. Instead of a trunk that merely has to support a neck and a head, a centaur has to support a full half-human right at the front of its body. That would shift the centre of mass way forward, so most of the weight would be on the middle limbs. That would affect its ability to gallop, because in a gallop most of the running power of a horse comes from the back legs. If the back legs are almost completely unloaded because all the weight is at the front, the back legs wouldn't be able to push with much force.

A more realistic centaur would have the trunk weight shifted backwards, so instead of having a human torso replacing its neck and head, it would be like a rider on a horse but without the rider's legs or the horse's head.

I would be holding on to my dick and balls so they don't smack me in the asshole every gallop.

"Humans can't run, what would they do with their arms?"

They hold the reins.

They hold crossbows.

They do the Choo Choo train with their arms.