Definition of boo-boos:
(n) :
(countable, colloquial, often childish) A mistake or error.
(n) :
(countable, colloquial, childish, by or to young children) A minor injury, such as a cut or a bruise.
(n) :
(uncountable, colloquial, childish, by or to young children) Feces.
(v) :
(colloquial, childish, intransitive) To make a mistake.
(v) :
(colloquial, childish, by or to young children, transitive) To defecate.