Jerk (noun)

1. A sudden movement or gesture, often made in response to a sudden impulse or to avoid something.
2. An unpleasant or contemptible person.

Origin:

Mid 17th century: of west african origin; compare with kikuyu cɛrkɛ.

Examples:

1. The car made a sharp jerk as the driver hit the brakes.
2. He made a sudden jerk to the left to avoid hitting the pedestrian.
3. She was tired of dealing with her boss's jerky behavior.
4. He's just a jerky kid who doesn't know how to treat others.
5. Her friends warned her that he was a notorious jerk and not to be trusted.