Like a running back, get it man, I'm straight off the block
JAY: We get it! and we’ll explain it to those who don’t.
Depending on the emphasis of some words, this is a triple entendre.
1) The literal meaning is that Jay is comparing himself to a running back in football, who uses the blocks from his teammates to get free and run up field.
2) The figurative meaning of “straight off the block” is that Jay came directly from selling crack on the corner of his block and immediately became a household name as a rapper.
3) Finally, when you emphasize the word straight in terms of its colloquial/slang meaning, Jay is saying that he is “straight”, as in financially secure, off of all the work he did selling crack on his block.
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