Jiggler

Part of speech: noun

Definitions

1. An apparatus designed to induce minor movements or tremors
2. A person who playfully engages in shaking or jostling actions
3. A tool made to create gentle shaking or vibration ; someone who moves their body in quick, small shaking motions

Etymology: "Jiggler" is a plain formation: the verb "jiggle" with the agent suffix "-er" added, so it names a thing or person that jiggles. The suffix "-er" has been attached to English verbs for centuries to name the doer of an action, as in "baker" or "singer," and "jiggler" follows that pattern directly. The verb it comes from, "jiggle," is a diminutive-style form of "jig," the lively dance, and it carries the sense of quick, small, repeated movement. That is why the noun covers both a mechanical device that produces gentle vibration and a person who makes rapid little shaking motions with their body.