Mama told me never stop until I bust a nut
Mrs. Shakur: “Now Toopie, promise me you won’t cross the street without looking for cars. And also, baby, remember never to stop making love to a girl until you’ve "busted a nut” (ejaculated). Don’t blue-ball yourself, sugar. It’s not good for your prostate"
but seriously, Afeni Shakur told Tupac to never quit, finish what you start.
He’s saying “fuck the world” in the next line which coincides with this one. The meaning being- fuck the world and never stop until you bust a nut. Explanation: the lines take the expression “fuck the world” into the literal context of actually “fucking” the world much as many other rappers have done which gives the lines the meaning: forget about the world but never stop trying to get something out of it until you’re satisfied.
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