n.) A chief excuse-maker; an individual who consistently comes up with absolute fucking bullshit excuses not to do something. the most generic excuses are pulled muscles such as quads and labias, although many others have been used as well.
Person 1 - "why isn't Fitz at conditioning today?"
Person 2 - "He's being a chief because he pulled his god damn quad again, this is the 20th fucking time! Did you notice that mitch was chiefing as well for his torn labia?"
Person 1 - "No, but I do now... those fucking chiefs"