That's from the pearl thanatos repeater pistol, isn't i? Near as can figure, it's a nod to "the sopranos", and it implies that all the people you shoot with it are.. how to tactfully say this... large kitty cats? More colloquially referred to as the nickname of a major character in the first two seasons of the aforementioned show. Following that train of thought, it's a weapon named after a reference, much like "The Dove", the gun you never need to reload, which references John Woo movies (which of course, in addition to being full of guns that don't need to be reloaded, are filled to capacity with doves in key scenes. Of course, I could be totally wrong.