* A misspelling: Perhaps it's a typo for a different term.
* A slang term: It might be a regional slang expression, a nickname, or a joke that's not widely known.
* Made up: It could be a completely fictional term created for a specific context.
To get a better understanding, please provide more context:
* Where did you hear it?
* Who used it?
* What was the situation?
With more information, I might be able to help you understand what "Joe Dacky" means.