It is often used to express affection or admiration for something or someone considered adorable, like a baby, a pet, or even a charming object.
Here's a breakdown:
* Que: This is the Portuguese word for "that" or "what."
* Lindinho: This is a diminutive form of "lindo" (beautiful, handsome). It's a playful and endearing way to refer to something as being cute or charming.
You can use it as an exclamation, a compliment, or even just a casual comment.