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Boo boo and boo typically don't have the same meaning. boo boo can refer to: 1) (noun) a mistake, usually a small one, but humorously a large mistake. 2) (noun) a small injury such as a cut or a bruise, used for children but humorously used for adults as well. 3) (verb; noun) the act of defecation (going poo), or the poo itself. 4) (adjective) general unattractiveness, lack of quality or badness. Because of it is a relatively simple and humorous sounding word, it may have many more colloquial meanings within families, friends or groups.
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