Hang on to your dreams kitten, you'll probably never hear this song
Let alone sip the mission long enough to listen
He’s calling this other rapper a “kitten” (a little pussy), telling him to keep doing his thing. Ace thinks he probably won’t ever hear the song, and even if he does, Ace doesn’t think he’ll ever become intelligent enough (“sip the mission”, the mission being a primary objective in life, amassing knowledge and becoming a wiser person) to decipher that Ace is talking about him.
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