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1.
Someone that is not very smart.
Someone that does something stupid.
Someone who is mentally challenged.

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!
by Lalalala! May 08, 2006

Words related to you're slow in the head like a big pizza pie

dumb retarded slow stupid weird