Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Informal A stupid mistake; a blunder: "the petty talking points, peripheral issues, tactical boo-boos, and small-bore scandals that regularly intrude on campaigns” ( New Republic).
  • n. Informal A slight physical injury, such as a scratch.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A mistake or error.
  • n. A minor injury, such as a cut or a bruise.

from the GNU version of the Collaborative International Dictionary of English

  • n. an embarrassing mistake.
  • n. a minor injury, such as an abrasion on the skin; -- child's talk.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an embarrassing mistake

Etymologies

Perhaps alteration of boohoo, to weep noisily.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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  • Also used as a term of endearment or nickname - primarily, but not exclusively, for babies/children.

    July 6, 2009

  • also, a mistake, goof-up

    December 14, 2006

  • an injury, esp. slight.

    December 10, 2006