Showed my ass at Summer Jam but New York was down wit' it
Now the ball's in my court never dribble out of bounds wit' it

from Game (Ft. Marsha Ambrosia & Nas) – Why You Hate the Game Lyrics on Rap Genius

Meaning

Even though Game is a west coast rapper, he is still popular on the east coast, as shown by his successful appearance at the NY Summer Jam. So, since he has all the momentum in the rap game (or has the ball in his court), he isn’t going to fuck it up (shown by dribbling out of bounds). In-fact, he is going to use this momentum to score, or increase his success even more.

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