kiddy [ˈkʰɪɾi]noun 3adjective 1verb 1forms 5 noun3 •A small kid (young goat). •(slang, no longer used) A man, a fellow; a person.So what I do kiddies, is work hard, stay in shape, practice. — 1970 •(slang, no longer used) A low thief. adjective1 •(informal) Childish.The concept is really old, the graphics look very kiddy, and the creators are making millions off it. — 2013 verb1 •(no longer used) To kid; to hoax or tease. formskiddied · kiddying · kiddies · kiddier · kiddiest