It's not brush fire rap, it's five alarm
A sick metaphor. A “brush fire” is a relatively minor crisis in terms of fires, but a “five alarm” is a huge crisis, with the five referring to the number of fire stations that had to fight the fire.
Pharoahe uses this metaphor by saying that he is not a minor threat to be overlooked. He is such a large threat to everyone that you’ll need all the help you can get to suppress him.
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