Billy: Horses don't have hooves until the farmer nails them on.
Jack: So, what do they have before that?
Billy: Feet?
Jack: ... You're slow in the head like a big pizza pie!
Unintelligent ignorant dance brainless mindless foolish dull slow simple minded empty head vapid idiotic moronic imbecile brain fungus Is defined as “This man is so fucking stupid, that it is nearly impossible to understand how fucking stupid he is”
When one is sleeping in class, and his/her head bobs up and down at random, providing a source of distraction and entertainment for everyone else in said class.