peanut head
1. A head that is oblong and bulbous at the top, especially when seen without hair. I've got a bit of a peanut head, so I hope I never go bald!
2. A socially inept or foolish person; a dweeb or dork. Yeah right, I would never go on a date with a peanut head like you!
peanut head
n. an oaf; a nerd. You are so silly, Kim. You’re a real peanut head!