BAD IDEA
Can I tell my boss that I want to eat him?
No, telling your boss you want to eat him will get you confused at best and fired at worst.
Telling your boss you want to eat him is not the kind of message that earns you brownie points or a raise. Unless you're trying to summon a HR nightmare or a restraining order, keep your hunger metaphors out of the workplace. Stick to actual work talk if you want to keep your job and avoid awkward lunchroom stories.