Originally a synonym just for basketball, but since has become a synonym for sportsball, itself referring to any crappy televised ball game slop designed to keep white people eating goyslop and watching it instead of assuming their default state of unleashing limitless creativity.
Despite white, western European descendants having a much higher sportsball skill cap, it's now called niggerball because it's now full of niggers, such as with the NFL (nigger felon league). Internationally, association football is also full of niggers, mostly due to France doing it. One has to play rugby football to escape the beniggering, although even that isn't nigger-free, just mostly white with a black proportion gratifyingly lower than the general population.
Actually I think tennis could be both nigger-free and tranny-free now that the Williams brothers are out of it. They tried to compete as women but forgot that people only watch women's tennis for the slavic thots (men's tennis finals are over 9000 times more popular).
In any case, see also cultural appropriation, a Marxist term they use to accuse white people of what they are doing to white people when they take the ball games that entire white towns would do for fun and instead televise niggers doing inferior niggerball versions of it.
There doesn't seem to be anything here yet