someone who has no fucking clue about anything.
You are a stupidhead.
A person who is usually really stupid. Someone who makes mistakes and doesn't realize it. A person that is clumsy, stupid, or just plain weird. But you know, you can be a stupidhead and still be cool and fun. It just depends.
"Well, he broke up with you, and he also took pictures of himself naked. What a stupidhead."