I’mma blow fo sho,

from Lloyd Banks (Ft. Eminem) – Where I'm At Lyrics on Rap Genius

Meaning

Meaning he is gonna blow up in the rap game.
Also could be reference to the previous line. He says love is like a “cancer”. One of the treatments for cancer is smoking marijuana, so he’s saying he’s going to smoke alot of weed (blow fo sho), because the love is like a cancer. Pretty clever.

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