When a man grows out his facial hair, but not quite yet a beard to capture the 'sexy-hunk on a deserted island' look popularized by the "LOST" character Jack, played by actor Matthew Fox. The effect is multiplied by having a Medical Degree. See also Sawyer Scruff
Hot Girl #1- 'Hey, check out the guy by the pool table!'
Hot Girl #2- 'Mmmmm... nice eyes and Jack Scratch, just the way I like it! Grrrrr...'