Term for someone who is open-minded enough to adopt an untenable theory (often some kind of crackpot conspiracy), yet close-minded enough to reject all criticism of that theory. The combination of echoing empty space and solid, impenetrable plastic makes rational communication impossible.
I tell you, this Illinois lottery result proves that Obama is the antichrist. You're wasting your time arguing with me, I have a plastic empty head.
A girl whose head is so large it resembles a large melon. Often accompanied by grotesque facial features such as an oversized and misshapen chin, forehead and nose. To compensate for this serious lack of physical attractiveness, these people will often post unflattering nude pictures of themselves online for attention. Good luck with that.