(1) Someone who is believed to heal through magical powers
WiktionaryText
Noun
A person who is believed to heal through magical powers; a shaman.
I told the witch doctor I was in love with you (2x) / And then the witch doctor he told me what to do / he said that "Oo ee oo ah ah, ting tang walla walla bing bang (4x)" (Alvin and the Chipmunks – The Witch Doctor)