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1.
Rap that isn't mainstream.

Backpack rappers are underground non-mainstream hip-hop artists. The backpack came from the fact that they used to carry backpacks to hold their rhymes and anything else that they chose to carry
Ex: Macklemore doesn't rap about getting pussy, but he raps about things that matter like gay rights.

"My man Mac has got some serious backpack rap skills!"
by positive influences February 07, 2014
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