Other niggas ain't in the game so they practice hate

from Jay Z – No Hook Lyrics on Rap Genius

Meaning

Yet ANOTHER double entendre! He’s starring in the game, while other dudes are on the PRACTICE squad, hoping to one day get in the game. The reason the haters aren’t in the game is probably because, instead of honing their hustle, they focus their energies on hating on Jay.

This line is probably a shot at De-Haven for accusing Jay of exaggerating

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