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[boo] /bu/
(used to express contempt or disapprobation or to startle or frighten).
noun, plural boos.
an exclamation of contempt or disapproval:
a loud boo from the bleachers.
verb (used without object), booed, booing.
to cry boo in derision.
verb (used with object), booed, booing.
to show disapproval of by booing.
1810-20; expressive formation


[boo, boh] /bu, boʊ/
Slang. marijuana.
Also called boo grass.
1955-60; of uncertain origin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for boo
  • It is sheer nonsense to suggest that boo is potentially more harmful than than dreck that can be purchased on the local store.
  • When he manipulated the audience to boo your issues, his charm rang hollow.
  • Be careful that they don't boo you for stating scientifically established facts.
  • They can do whatever they please, and no other nation can say boo because they hold such a large percentage of the world's oil.
  • One is good for all, regardless of the lunacy of a boo-boo vs guts spilling out onto the ground.
  • We cheer on the good guy and boo when the bad guy gets a leg up.
  • Oh, look, two years in a row with trillion dollar deficits and boo to show for it.
  • boo to the lazy editor who came up with the lame label.
  • The peek-a-boo virtual keyboard is decent for slow touch-typing.
  • His career by now seems virtually boo-boo-proof-and so does his nonchalant image.
British Dictionary definitions for boo


an exclamation uttered to startle or surprise someone, esp a child
a shout uttered to express disgust, dissatisfaction, or contempt, esp at a theatrical production, political meeting, etc
would not say boo to a goose, is extremely timid or diffident
verb boos, booing, booed
to shout "boo" at (someone or something), esp as an expression of disgust, dissatisfaction, or disapproval to boo the actors
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for boo
"to startle," early 15c., boh, "A combination of consonant and vowel especially fitted to produce a loud and startling sound" [OED, which compares L. boare, Gk. boaein "to cry aloud, roar, shout."]; as an expression of disapproval, 1801 (n.), 1816 (v.); hence, the verb meaning "shower someone with boos" (1893). To say boo "open one's mouth, speak," originally was to say boo to a goose.
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for boo

boo 1


Excellent; remarkable: Something that used to be known as the cat's whiskers is now called ''deadly boo'' (1950s+)


Marijuana or another narcotic: I got over there and she lays this dynamite boo on me, I mean super shit (1930s+ Jazz musicians)

Related Terms


[noun sense said to be fr black English jabooby, ''marijuana, so called because it induces a state of fear or anxiety,'' of unknown origin; but possibly fr Budda, ''marijuana'']

boo 2

  1. An exclamation of disapproval, the equivalent of a hiss (1890s+)
  2. A supposedly frightening exclamation, such as a ghost might give: She jumped out of the closet and hollered ''Boo!'' (1940s+)

: Next time at bat he was roundly booed

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Related Abbreviations for boo


Bootes (constellation)
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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