Meaning that he keeps his silver grey tabby coat immaculate by grooming himself with his tongue. I'm no expert, but my understanding was that baring certain circumstances such as: the cat is too old to care for him/herself; that cat has long matted fur and needs a groomer's attention; the cat gets sprayed by a skunk or into some other mess, they don't need regular baths, as opposed to for example a dog. My cat is indoor only, maybe this makes a difference.