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Longman Dictionary of Contemporary English
boo-boo
noun
EXAMPLES FROM OTHER ENTRIES
▪ Do you have a boo-boo on your knee?
EXAMPLES FROM CORPUS
▪ This kind of elementary boo-boo would certainly impact video speed.
The Collaborative International Dictionary
boo-boo

boo-boo \boo-boo\ n.

  1. an embarrassing mistake.

    Syn: blunder, blooper, bungle, foul-up, flub, botch, boner, misdoing.

  2. a minor injury, such as an abrasion on the skin; -- child's talk.

Douglas Harper's Etymology Dictionary
boo-boo

"mistake," 1954, apparently a reduplication of boob, which had acquired a secondary sense of "foolish mistake" (1934).

Wiktionary
boo-boo

alt. 1 (context colloquial often childish English) A mistake or error. 2 (context colloquial childish by or to young children English) A minor injury, such as a cut or a bruise. 3 (context colloquial childish by or to young children English) feces. n. 1 (context colloquial often childish English) A mistake or error. 2 (context colloquial childish by or to young children English) A minor injury, such as a cut or a bruise. 3 (context colloquial childish by or to young children English) feces. vb. (context colloquial childish by or to young children English) To defecate.

WordNet
boo-boo

n. an embarrassing mistake [syn: blunder, blooper, bloomer, bungle, foul-up, fuckup, flub, botch, boner]

Wikipedia
Boo-Boo (EP)

Boo-Boo is the debut EP from Boston band Big Dipper. The EP was remastered and released as part of Merge Record's Supercluster: The Big Dipper Anthology set in 2008.

Usage examples of "boo-boo".

This is not some teensy boo-boo, but a scandal of monstrous dimensions.

My name is Kristy Thomas and I'm thirteen and in eighth grade And there are two other members of the Brewer/Thomas household - Shannon, who is David Michael's puppy (she's a Bernese mountain dog), and Boo-Boo, Watson's cat.

And we have a Bernese mountain dog puppy named Shannon, a fat old cat named Boo-Boo, and several other pets, including a puppy we are training to be a guide dog.

Now they have a Bernese mountain dog named Shannon, plus Watson has this old, fat cat named Boo-Boo.

So it's a pretty full house right now, especially when you throw in Shannon, the Bernese mountain dog puppy, and Boo-Boo, the fat, mean, geriatric cat.

Boo-Boo had kindly shared with her the early-morning report of the very bizarre destruction of a television station in the northwestern United States.