Jacaiden
A person who has a brain the size of a raisin, a head like a scrambled egg, and a habit of being a complete disaster with a lump on their head.
Post: "My brother is a Jacaiden. He got into a fight with the pizza guy."
Message: "She's a Jacaiden. She doesn't know what she's talking about."
Comment: "He's a Jacaiden. He yells at the sky."