(countable, colloquial, often childish) A mistake or error. / (countable, colloquial, childish, by or to young children) A minor injury, such as a cut or a bruise.

(colloquial, childish) To make a mistake. / (colloquial, childish, by or to young children) To defecate.

plural of boo-boo

simple past tense and past participle of boo-boo

present participle of boo-boo

Alternative form of boo-boo

plural of boo boo

A loud exclamation intended to scare someone, especially a child. Usually used when one has been hidden from the victim and then suddenly appeared unexpectedly.

A derisive shout made to indicate disapproval.

(intransitive) To shout extended boos derisively. / (transitive) To shout extended boos at, as a form of derision.