Vibrato is a type of audio distortion that modulates the pitch using a wave pattern over time, without changing the speed of the footage. In other words, it makes it sound "dizzy" or "sproingy".

Usage

The easiest way to use Vibrato historically is with Vegas (which has a built in plugin) and Audacity (which does as well). Premiere doesn't have one, but MVibrato is a solid alternative.

Vegas

Audacity

MVibrato