Any souped out/pimped up car with a loud stereo system, especially base to annoy the living shit out of everyone in a 5 mile radius; makes good target practice in the wrong neighborhoods to get it's tires shot out.
"Hear about Diesel's ride, man?" "Nah man what happen?" "Left his negromobile run idle outside to make a drug deal, and that mofo got shot to shit."
A really beat up, ancient car driven by a black person.
Holy crap, look at that beat up negromobile. ( nee-GRO-mo-beel)