Home › Words › K › kiddokiddo/ˈkɪdoʊ/kiddo means A close friend; especially used as a form of address.kiddo is pronounced /ˈkɪdoʊ/.EtymologyFrom kid + -o; see kid (“child”).nounA close friend; especially used as a form of address.e.g.“Okay, kiddo, I gotta run.”A child.Definitions & examples from Wiktionary (CC BY-SA 3.0).