Definition & Meaning of "air one's lungs"

What is the origin of the idiom "air one's lungs" and when to use it?

The origin of the idiom "air one's lungs" is not certain, but it is believed to have originated in the late 16th or early 17th century. At that time, the phrase was used to describe the act of clearing one's lungs by taking deep breaths, often in an effort to relieve stress or tension. Today, it is used to communicate using impolite or vulgar language, often with inappropriate sexual content