We agreed that questions exclusively about dialects are off-topic when they don't related to the Italian language.
But sometimes the OP doesn't know whether the expression is dialectal or not, especially if she's not a native speaker, so some questions in the form
What's the correct use of X?
implicitly (or explicitly) become
Is X a dialectal expression?
In case the answer is yes, how should we deal with such questions? Should we consider them off-topic since the expression is dialectal? Or are they on-topic since the question is actually not about the usage of a dialectal term, but just about clarifying whether is dialectal or not?
An example is the question Origini ed etimologia della particella 'nee' alla fine di frasi in dialetti del Nord Italia.
The expression is clearly dialectal, but the OP didn't know it. I answered explaining the meaning and clarifying that it's a dialectal term, but I then wondered whether it should be closed instead.