What does the idiom it inside and mean?

The idiom "it's inside and out" is not a common idiom in English. It's likely a misunderstanding or a phrase that someone has created.

Here's what the idiom "inside and out" means:

* Completely and thoroughly: "I know this city inside and out."

* With full understanding: "He studied the manual inside and out."

* From beginning to end: "We went over the project inside and out."

Possible interpretations of "it inside and mean":

1. "It" refers to a person, place, or thing: The phrase "it's inside and mean" might be used to describe something that's both contained within something else and also unpleasant or malicious. However, this usage is uncommon and informal.

2. A typo or mishearing: It's possible that the phrase was meant to be "it's inside and out," or "it's inside and mean *to*," which could indicate the person or thing has malicious intentions.

If you can provide more context about where you heard this phrase, it may be possible to provide a more accurate interpretation.