As full as an egg

Where does this saying come from?
Has anyone ever heard it before or does it originate in the Wiggins family?

I've never heard it. I have heard "full as a tick" or "tight as a tick." Where does the Wiggins family live?

Originate? Not unless Shakespeare was a Wiggins. "Thy head is as fun of quarrels as an egg is full of meat, and yet thy head hath been beaten as addle as an egg... " etc. Mercutio, R&J, Act I