boo-boo

noun
  1. 1

    A mistake or error.

  2. 2

    (by or to young children) A minor injury, such as a cut or a bruise.

  3. 3

    (by or to young children) Feces.

verb
  1. 1

    (by or to young children) To defecate.

Source: https://en.wiktionary.org/wiki/boo-boo