The phrase "black ball" means to reject or exclude someone from a group or activity, often by casting a negative vote or giving a disapproval in a secret ballot. Full definition
When she was a kitten she was just a cute little black ball of fluff. (theinspiredroom.net)
Notice that black ball of fur in the back ground? (stowandtellu.com)
in a shimmery black number with a one - shoulder tulle overlay, peep - toe heels and an era - appropriate updo at the Mad Men Red & Black ball in L.A. (people.com)