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1.
Perjorative term; urban slang for a black bowling ball(s).

"The Klansmen attacked African Americans in the Bowling Alley with baseball bats, while the Aggie decided to attack the bowling balls. When asked why, the Aggie said he wanted to "smash their Nigger Eggs".
de Missy Kens 6 janvier 2007
 
2.
Synonymn - A bowling ball.
"Luther is clearly dumber than a sack full of nigger eggs."
de Ol' KY Dad 11 novembre 2009
 
3.
Slang for watermelons.
Hey Cletus, that pallet of Nigger Eggs reminds me of "Invasion of the Body Snatchers"
de Mr. Whiiiiite 8 mars 2009