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1. slang An ambulance, especially on its way to a gruesome incident. I had to sit there and hold my own guts in place while we waited for a meat wagon to arrive. They loaded up the poor guy into the meat wagon, his leg barely attached to his body anymore.
2. slang Any vehicle, such as that of a coroner, used to transport a dead body from some place to a morgue. Police set up a barrier around the area until a meat wagon could come and collect the body.
n. an ambulance. The meat wagon showed up just as they were pulling what was left of Marty out of what was left of her car.