Holy mackerel的意思

"Holy mackerel" is an exclamation that is used to express surprise or amazement, similar to "holy cow" or "holy smokes." It is a mild oath or interjection that is often used in a playful or humorous manner. The phrase is not commonly used in formal contexts and is more likely to be heard in casual conversations or in situations where someone wants to express surprise in a lighthearted way.