watermelon head

adj: A term used to describe someone with a head that is out of proportion with their body.

noun: A literal watermelon for a head, typically placed on a corpse by naughty teenagers.

Wow! My Grandma has a watermelon head! If I catch the degenerate that did this, I'll eat their ass!

Wow! My best friend sure had a watermelon head, its too bad the police blew half of it off cause he was black.