noun, a car with specific characteristics, usually an older model muscle car or large style of car with a large engine which is generally visually deteriorated. Most often the car will have a lot of engine noise, whether from a bad exhaust system or badly tuned engine. Think really obnoxious car. It may explode at any minute, it's so obnoxious.
Man, that car is a bomb." Upon hearing or seeing a car come down the street "Look at that bomb