First there was McDreamy ... then McSteamy ... but has the cast of Grey's Anatomy's come up with a nickname for the newest hot doc, Kevin McKidd? "I think somebody said 'McBadAss,' which made me laugh!" he tell Rachael.

Kevin, who portrays a doctor suffering from post-traumatic stress disorder, talks about the importance of his role. "I think it's really brave of the show, and I'm really proud of the fact that we're really talking about this in prime time. We're really opening up the subject because there are many service men and women who feel they can't talk about this -- that they have these problems -- because there's this stigma [in the military] that you're supposed to be tough."

Watch the video above to how Kevin handles a round of "Ray's Anatomy" -- can he fare better than his co-star Patrick Dempsey?