A "Doc Holliday Cough" is the unsettling, abrupt and ill-sounding cough produced by an ostensibly healthy individual. Doc Holliday, the sharp
shooting associate of Dodge City
lawman Wyatt Earp, was known to have terminal tuberculosis and in film is often
portrayed as being wracked by fits of coughing.
A "Doc Holliday Cough" is a cough that, without any other evidence or observation, imparts
of illness or poor health.