WordReference Random House Learner's Dictionary of American English © 2020
boo-boo /ˈbuˌbu/USA pronunciation   n.[countable]pl.  -boos.  Slang.
  1. Slang Termsa stupid mistake;
    blunder.
  2. Slang Termsa minor injury.

WordReference Random House Unabridged Dictionary of American English © 2020
boo-boo  (bo̅o̅bo̅o̅′),USA pronunciation n., pl.  -boos. [Slang.]
  1. Slang Termsa stupid or silly mistake;
    blunder.
  2. Slang Termsa minor injury.
  • baby talk 1950–55, American.

Collins Concise English Dictionary © HarperCollins Publishers::
boo-boo n ( pl -boos)
  1. informal an embarrassing mistake; blunder
Etymology: 20th Century: perhaps from nursery talk; compare boohoo
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