From Longman Dictionary of Contemporary Englishbozobo‧zo /ˈbəʊzəʊ $ ˈboʊzoʊ/ noun (plural bozos) [countable] informalSTUPID/NOT SENSIBLE someone who you think is silly or stupid Who’s the bozo in the pyjamas?
Examples from the Corpus
bozo• That way, there was a guaranteed absence of bozos.• I re-member the night that big Texas oil bozo gave Jack lip.• In the back there's bozo and me.• Who's that bozo in the purple shirt?• I don't want to talk to the bozos.• They were ... yes I now concede, complete and utter bozos.Origin bozo (1900-2000) Perhaps from Spanish bozal “stupid” or from Italian bozzo “cuckold, unpleasant person” 