Athetosis:

A form of dyskinesia characterised by slow, involuntary 
movements of the hands and feet 

A condition in which there is a succession of slow, writhing, 
involuntary movements of the fingers and hands, and sometimes 
of the toes and feet. 

A type of cerebral palsy characterized by uncontrollable 
twisting motions; generally accompanied by difficulty with 
oral language. 

a continuous succession of slow writing involuntary movements 
of the hands and feet and other body parts