Definition: A pyohemothorax is a misnomer coined to describe what it sounds like when you're about to vomit or leak blood, which is usually caused by an infection. It can be mistaken for a "vomite," but in reality, the sound you hear is due to the rapid exhalation of air and the sound of air flowing out of the mouth, rather than a normal cough. This term has become widely used as a way to describe something that sounds like vomiting or bleeding when it's not actually happening.