Is zero at the bone is a slang expression?

"Zero at the bone" is not a commonly recognized slang expression. It's possible it's a very niche or regional term, but there's no widespread understanding of what it means.

Here's why it's unlikely to be a slang expression:

* Lack of common usage: There's no record of this phrase in major slang dictionaries or online resources.

* Unclear meaning: The phrase itself doesn't immediately suggest a clear meaning, which is usually a characteristic of slang.

If you heard this phrase used, it's likely:

* A misunderstanding: You might have misheard the actual phrase.

* A regional or group-specific term: It could be a slang expression used in a very specific geographical area or among a particular group of people.

To clarify the meaning, you could try:

* Asking the person who used the phrase: "What do you mean by 'zero at the bone'?"

* Providing context: "Can you tell me more about what you meant when you said 'zero at the bone'?"

Without more information, it's impossible to determine the meaning or origin of this phrase.