1 [boo]
(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 Unabridged


2 [boo, boh]
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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World English Dictionary
boo (buː)
1.  an exclamation uttered to startle or surprise someone, esp a child
2.  a shout uttered to express disgust, dissatisfaction, or contempt, esp at a theatrical production, political meeting, etc
3.  would not say boo to a goose is extremely timid or diffident
vb , boos, booing, booed
4.  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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"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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American Heritage
Abbreviations & Acronyms
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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Example sentences
It is sheer nonsense to suggest that boo is potentially more harmful than than dreck that can be purchased on the local store.
One is good for all, regardless of the lunacy of a boo-boo vs guts spilling out onto the ground.
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.
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