Yes, jerking is a Scrabble word!

Verb

1. Pull, or move with a sudden movement

2. Move with abrupt, seemingly uncontrolled motions

3. Make an uncontrolled, short, jerky motion

4. Jump vertically, with legs stiff and back arched

5. Throw or toss with a quick motion

Adjective

1. Lacking a steady rhythm

Noun

1. An abrupt spasmodic movement