WordReference Random House Learner's Dictionary of American English © 2015
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 © 2015
boo-boo  (bo̅o̅bo̅o̅′), 
n., pl. -boos. [Slang.]
  1. Slang Termsa stupid or silly mistake;
    blunder.
  2. Slang Termsa minor injury.
Etymology:
  • 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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