bo ‧ zo /ˈbəʊzəʊ $ ˈboʊzoʊ/ BrE AmE noun ( plural bozos ) [countable]
[ Date: 1900-2000 ; Origin: Perhaps from Spanish bozal 'stupid' or from Italian bozzo 'cuckold, unpleasant person' ]
informal someone who you think is silly or stupid:
Who’s the bozo in the pyjamas?