see I'm not sure about this, I guess it depends on the job, colorful language can be a sign of comfort among colleagues, profs in my dept cuss like sailors

Profanity has become so common (especially amongst younger generations) that I think people often forget that it is still very offensive to many and may even be viewed as a weakness by professionals, either because it may demonstrate an inability to articulate or an insufficient vocabulary to say what you mean without resorting to "colorful" language.
Seems to me that a person would be wise to avoid the possibility of offending the interviewer. Save your profanity for some other time.

It's a pretty unique situation if a person actually got "the job" because they cussed!