jerking (Adjective) — Lacking a steady rhythm.
jerking (Noun) — An abrupt spasmodic movement.
jerking (Verb) — Pull, or move with a sudden movement. ex. "He turned the handle and jerked the door open"
jerking (Verb) — Move with abrupt, seemingly uncontrolled motions.
jerking (Verb) — Make an uncontrolled, short, jerky motion.
jerking (Verb) — Jump vertically, with legs stiff and back arched.
jerking (Verb) — Throw or toss with a quick motion. ex. "jerk his head"