Soul of a 70's number man, I can throw a curve underhand
The 1970’s was when the Soul genre was predominate, so Joe is claiming he has a lot of soul.
Numbers game is a lottery game where the bettor tries to predict the right number for the week. A numbers man is one who goes door to door to collect these bets. Most numbers men were gangsters too.
He’s also saying he can throw a curve underhand — something that nobody can really do, making it seem like he can do things nobody else can in rap.
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