Etymology
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boo-boo (n.)

"mistake," 1954, apparently a reduplication of boob "stupid person," which had acquired a secondary sense of "foolish mistake" (1934). In 1930s it was the nickname of Philadelphia gangster Max "Boo-Boo" Hoff.

updated on October 10, 2017

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Definitions of boo-boo from WordNet

boo-boo (n.)
an embarrassing mistake;
Synonyms: blunder / blooper / bloomer / bungle / pratfall / foul-up / fuckup / flub / botch / boner
From wordnet.princeton.edu, not affiliated with etymonline.