Definition of woo-woo
: dubiously or outlandishly mystical, supernatural, or unscientific
- And she has written a book … in which she dismisses what she calls "woo-woo spirituality" in favor of some straight talk on living with loss …
- —Linda Richman
- Energy beams from the eyes certainly sounds like woo-woo stuff …
- —Steve Blow
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woo-woo
noun-
- One man's woo-woo, of course, is another's deeply held belief system.
- —Julia Moskin
