I need to see the full sentence to explain "out there."
It could mean that something was a crazy or a far-fetched idea.
If the sentence was "What is out there?" it simply means "What is outside?"
Native speakers often use double negatives. It's not "standard" English and it's not used in my house.
In books or movies, characters speak that way to show a lack of education or sophistication.
Student or Learner