A combination of dipshit and dickhead, this term is generally used when a person becomes so frustrated at another, that their words become scrambled.
No, I will not lick your butt you diphead!
Rose and Nat are such dipheads, they think they rock the PIC.
A Diphead is created by pushing on an infant's soft spot carefully enough not to kill it, but firmly enough to mentally handicap it. They are used as portable bowls for dip and salsas.
"I use my Diphead for nacho cheese, and a candy dish when my nephews come over!"