What is the meaning of idiom you out in a

The idiom "you out in a" is not a recognized idiom in English. It's likely you're referring to a different phrase, perhaps one of the following:

* "You out of your mind?" - This is a common expression of disbelief or shock, usually used when someone is behaving irrationally or making a particularly bad decision.

* "You out of luck?" - This means that someone has experienced misfortune or is in an unlucky situation.

* "You out of it?" - This means that someone is not fully present or aware of their surroundings, possibly due to being tired, drunk, or under the influence of drugs.

* "You out of touch?" - This means that someone is unaware of current events or trends, often due to being isolated or living in a different time or place.

Please provide more context or information about the phrase you're asking about, and I can give you a more precise answer.