A person or a child who is cute, funny, and innocent. A way to describe someone lovingly who you cannot get over what they said, did, or just the way that they are because they are so darn cute! Must be said in a whiney-tone of voice. Nugggettt! Use it and people will follow your lead.
Friend: "What's a nugget?"
Me: "Don't know. Ask Felix he's a nugget. He knows."