An insult coined by democratic candidate
Michael Bloomberg in a series of tweet exchanges between himself and President
Donald Trump in 2020. Both are from New York.
Michael combines two insults. A
carnival barker is an employee in cheap showy clothes, "barks" (yells) to attract patrons. He is usually position in a stand in front of decrepit attractions, such as freak shows and erotic dance shows.
"Clown" is just added as a typical New York put-down.