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>
woo–woonoun <One man's woo-woo, of course, is another's deeply held belief system. — Julia Moskin>
Origin and Etymology of woo–woo
probably from the interjection woo-woo as a conventional representation of an eerie or ghostly sound
First Known Use: 1992
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