What is Baby lungs?

Coughing up an off collored(greenish brown)colloidal lump of sputum that looks just like a human fetus complete with umbilical cord .

Within a two week period we both coughed up a lung baby .

Baby lungs - video

Baby lungs - what is it?

Someone that coughs consistently after each hit as though its their first time smoking.

"Damn John! You got some fucking baby lungs, quit coughing."