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the figurative 'band wagon' someone jumps onto when riding someone's meat. In other words, one will jump upon the meatmobile when they begin to talk negatively about someone else.

Paw: Mad about him hardcore chill'n

Nort: Mad he needs to do something with himself, really.

Paw: Um, mad about your backseat riding, who said you could jump on the meatmobile?
by Hardcore... September 30, 2007