Definition from Wiktionary, the free dictionary
See also Bozo
- Originating c. 1910. Maybe from Spanish bozal, a term used in slave trade and meaning "one who speaks Spanish poorly."
- First used in USA English as a vocative, from Spanish vosotros = "you": compare buster#Etymology.
- After Bozo the Clown, a clown character very popular in the USA in the 1950s
- After Anselm of Canterbury's usage of the early continental European Germanic-origin personal name Boso.
- Rhymes: -əʊzəʊ
bozo (plural bozos)
Derived terms 
(slang) A stupid or foolish person