Origin of boo

First recorded in 1810–20; expressive formation

Definition for boo (2 of 3)

[ boo, boh ]
/ bu, boʊ /


Slang. marijuana.

Origin of boo

First recorded in 1955–60; of uncertain origin
Also called boo grass.

Definition for boo (3 of 3)

[ boo ]
/ bu /

noun Slang.

one's boyfriend or girlfriend.

Origin of boo

1985–90; possibly an alteration of French beau boyfriend, admirer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for boo

British Dictionary definitions for boo

/ (buː) /


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 or booed

to shout "boo" at (someone or something), esp as an expression of disgust, dissatisfaction, or disapprovalto 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