EXAMPLES FROM THE WEB FOR BOO
And you look now as if somebody's ghost had riz and hollered 'Boo!'
He dashed up noisily from the underbrush, swung his arms, and shouted, “Boo!”
Our sleigh tumbled on one side or the other, upsetting before we could say "Boo!"
In the daytime she has a weakness for picture hats, and she can't say boo to a goose.'
But this time Miss Wayne never said 'boo,' when I couldn't hold in any longer.
Lead us to what you like; you have brains,” returned the man who had previously said “boo!
Your mother and Chet and Boo are going to have supper with Switchie and his folks.
He wanted to try to find his father and his mother and Chet and Boo.
When he awakened his brother Chet and his sister Boo were in the cave looking at him.
"I don't care what you call me," said Boo, speaking in lion talk of course.
expression meant to startle, early 15c., boh, "A combination of consonant and vowel especially fitted to produce a loud and startling sound" [OED, which compares Latin boare, Greek boaein "to cry aloud, roar, shout."]; as an expression of disapproval, 1801 (n.), 1816 (v.); hence, the verb meaning "shower someone with boos" (1893).
Booing was common late 19c. among London theater audiences and at British political events; In Italy, Parma opera-goers were notorious boo-birds, but the custom seems to have been little-known in America till c.1910.
To say boo "open one's mouth, speak," originally was to say boo to a goose.