It is a very popular exclamation in central Colombia especially in the Departments of Huila and Tolima. It means poor (diminutive of poor, but in a very pitiful or compassionate sense).
Exclamation to indicate compassion. Widely used in Colombia and Venezuela. The origin comes from overuse with its abbreviation of the word "poor" in the sense of pity.
It's a synonym for poor thing, a way to consider the difficult situation a person is going through.