bozo(noun) noun1. a man who is a stupid incompetent foolSimilar word(s): cuckoo, fathead, goof, goofball, goose, jackass, zanyDefinition categories: person, fool, muggins, sap, saphead, tomfool2. an informal term for a youth or manSimilar word(s): cat, guy, hombre, sodDefinition categories: person, man