Source : Webster's Revised Unabridged Dictionary (1913)

Jerky \Jerk"y\, a.
   Moving by jerks and starts; characterized by abrupt
   transitions; as, a jerky vehicle; a jerky style.

Source : WordNet®

jerky
     adj : not having a steady rhythm; "an arrhythmic heartbeat" [syn:
           {arrhythmic}, {jerking}, {unsteady}]
     n : meat cut in strips and dried in the sun [syn: {jerked meat}]
     [also: {jerkiest}, {jerkier}]