To eat like a horse, to eat a lot.

狼吞虎咽，吃的很多。

You might also tell your examiner, I love to eat like a horse.

你可能还会告诉考官，我喜欢像马一样吃东西。

But sometimes I can't help but to eat like a horse and then take a long nap.

但是有时候我忍不住要暴食，然后小睡一会儿。

Therefore, to eat like a horse is to eat a lot you love to eat food in a big amount.

因此，像马一样吃就是指你喜欢吃很多食物。