Also Referred to as either a black Persons BALLS or a Black Plastic/marble/etc. kinda ball it Can be used either way it is more commonly found in gaming when someone either shouts "BLACK BALLS" Referring to alot of things like for instants A Black Man in general, A Classified A tier Legend of a man, etc. You can even Shout "BLACK BALLS" as a confidence boost or to seem cool. there are a million in one ways to use it. i could only come up with a few.
The word being defined
Ballsacks: Dude do you wanna suck on my blacksack of balls(or Blacksack)
BlackBall(S): Hey, dude/babe (or anyone you are talking to) Do you wanna go jump into the BlackBall Pit?