WordReference Random House Learner's Dictionary of American English © 2014
boo-boo /ˈbuˌbu/USA pronunciation n. [countable],pl. -boos. Slang. Slang Termsa stupid mistake;
blunder.
Slang Termsa minor injury.

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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