It's possible that:
* It's a regional or slang expression: The phrase might be used in a particular community or region with a specific meaning.
* It's a misunderstanding or mishearing: There might be a similar phrase with a clear meaning that has been misheard or misinterpreted.
* It's a made-up phrase: Someone may have invented the phrase for a specific purpose, like a joke or a creative work.
To understand its meaning, you need more context.
Please provide the following information:
* Where did you hear or read the phrase?
* What was the context of the phrase?
* Who said it?
With more information, I can help you understand the meaning of "You shovel smoke."