What does captain cook at a horse mean?

There's no phrase or idiom called "captain cook at a horse". It's likely a misunderstanding or a play on words.

Here's why this might be confusing:

* Captain Cook: A famous explorer, not a culinary term.

* Cook: A verb related to preparing food.

* Horse: An animal, not something you'd typically cook.

It's possible someone is trying to be funny or make a joke.

Here are some possibilities:

* A pun: They might be playing on the idea of "cooking" something else, like a horse's meal.

* A made-up phrase: It could be a completely invented phrase used for humor.

If you can provide more context, I might be able to help you understand what they meant!