I know I'll get killed for this.

When your son hits you, swat his butt. Hard enough to hurt. There is NO reasoning with a 2 year old. He, like all 2 year olds, lacks the capacity to really understand the ramafications of his actions.

But he will understand a swat to the butt. I know, I know. This is child abuse.

No, it is not. I am not advocating beating him. But you need to get his attention. And right now, you do not have it.

Please, before you call me terrible names and curse me for the abuser that I am (not), google Pros for spankning kids.

Spanking is a last resort. But if your son is biting other kids I would say that it is time for drastic measures.