Text book definition.

VOODOO.

n., pl., -doos.

1. A religion practiced chiefly in Caribbean countries, especially Haiti, syncretized from Roman Catholic ritual elements and the animism and magic of slaves from West Africa, in which a supreme God rules a large pantheon of local and tutelary deities, deified ancestors, and saints, who communicate with believers in dreams, trances, and ritual possessions. Also called vodoun.
2. A charm, fetish, spell, or curse holding magic power for adherents of voodoo.
3. A practitioner, priest, or priestess of voodoo.
4. Deceptive or delusive nonsense.