Cannibalism is when a species eats it's own kind. Though I agree that if kingnskaes become aggressive around other snakes (believing you here, I know nothing about kingsnakes) Axel28 should wash their hands, but it's not cannibalism, per say. That's more of "wash your hands between each kingsnake so they don't smell their own kind".
I don't mean that in a rude manner I'm just trying to add some more info.