Fed cars, we ride dirty because the block's hot

from Murs (Ft. 9th Wonder) – Tale Of Two Cities on Rap Genius

“Fed cars” are police cars. “Ride dirty” means to stash drugs, guns, and other illegal contraband in order to hide it from the cops. “Block is hot” means there are many police around. Murs and his boys used to hide shit in his car in order to avoid confrontation with the police

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