Somebody who doesn't think before or while they act. A Cakehead is unlikely to understand conversation between normal people but will generally make up for it in strength and aggression. Cakeheads are not the smartest of creatures and can be easily distinguished by the occasional grunt and pulling big watts in the gym.
Ogre from revenge of the nerds is such a Cakehead.
He is all power and no technique, what a Cakehead.
A cake baked for one's deceased mother on the anniversary of her birth or death. Also means explicit stuff that burns itself into one's brain after reading the article on Urban Dictionary (i.e. Alabama Hot Pocket or similar).
"Unfortunately, I didn't realize that Ghost Cake is a really bad thing on Urban Dictionary, and now it's burned into my brain."