Definition
Someone or something which moves rapidly or hurriedly from place to place.
How People Actually Use It
One of the many mistical figures that leads you into a hole of psychological discovery. Sometimes related to using psychedelic drugs like lsd, but also used in hypnosis and meditation to reach a desired destination (such as a different level of consciousness or location) The main verb attached to the white rabbit is to follow.
"Follow the white rabbit."
Source: Urban Dictionary