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floppy head disease 

The inability to raise, lower, turn, and/or control your own head due to weak, injured, or insufficient neck muscle
Since she was notoriously clumsy, she tended to avoid newborns during their floppy head disease stage. It was really in everyone's best interest.

After being slammed to the ground repeatedly during the women's tackle football game, when she couldn't pick her own head up off of the pillow, she realized with a sinking feeling that she had adult onset floppy head disease.

Flappy head

A person addicted to the infamous mobile game "Flappy Bird".
Ole' boy over there is a full on flappy head, straight fiending for some bird through pipe action.
Flappy head by Awol239 February 13, 2014