A retribution car is the vehicle you buy after your original car has been taken away/sold without your approval (for example: your original car was taken in a divorce settlement or was sold by a co-signer). The retribution car is a better, saucier, or somehow sassier vehicle than the original.
Bridget: My dad was an a-hole and sold my super cute 2004 carolla without my permission!
Eden: Oh my god! What did you do?
Bridget: I bought an even cuter 1987 2-door BMW in amazing condition. I paid in full so the title is in my name and sent him some pics of the new vehicle.
Eden: Nice retribution car!