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Ballismus
A type of involuntary movement in which one violently flings or jerks a limb (or limbs) in an uncoordinated manner. A limb is an arm or a leg. Ballismus is caused by a lesion (such as a bleed or tumor) in the part of the subthalamus (an area in the lower part of the brain) opposite of the affected side of the body. Usually, one side of the body is affected, and thus the condition is referred to as hemiballismus (because "hemi" is Greek for "half"). Ballismus comes from the Greek word "ballismos" which means "jumping about."
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