Definition & Meaning of "woo woo"in English

What is the origin of the term "woo woo" and how is it used?

"Woo woo" is a slang term for a person regarded as irrational, gullible, or prone to believing in pseudoscience or supernatural claims. It emerged in mid-20th-century English, likely imitating the whimsical or nonsensical sounds associated with mystical or fringe beliefs. The term is used in informal, mocking, or skeptical contexts, often to dismiss someone's ideas as fanciful or unscientific. It is mildly derogatory, context-dependent, and not vulgar, signaling disbelief or ridicule rather than strong insult.