Like all skull tattoos, cat's skull tattoos herald a life beyond death. In the ancient Egyptians' concept, the cat is the embodiment of God, because the cat's eye can shine in the dark, so they think that the cat's eye can store sunlight, this sunlight can disperse the dark ghost, so the cat is regarded as a sacred animal.
Cats are mysterious creatures with quiet and humble qualities. Given the close connection between cats and the afterlife, cat skull tattoos are seen as a more subtle way to symbolize your understanding and acceptance of the inevitable. In a sense, it's a sign of bravery, because it shows that you're not afraid to face death.