Earnist
An Earnist is a guy who talks too much about how smart he is. He'll brag about his brain and then forget his own name. But he's still cool, because he's got a heart of gold and a brain of trash.
Earnist: 'I have a PhD in being smart. You have a PhD in being dumb.'
Earnist: 'I'm smart. I just forgot my brain at the store.'
Earnist: 'I'm not bragging. I'm just stating the obvious.'