It literally translates to "Oh there, there" but has evolved into a more general exclamation of pleasure. It's often used to describe something attractive, stylish, or exciting.
Here are some examples of how you might use "Ooh la la":
* "Ooh la la, that dress is stunning!"
* "Ooh la la, what a delicious meal!"
* "Ooh la la, that view is incredible!"
The expression can be used playfully or seriously, depending on the context.