Name of Chrysler's parts division (More Parts) but colloquially used by car enthusiasts as an umbrella term to include all of Chrysler's car brands (Plymouth Dodge DeSoto Chrysler Imperial Eagle Valiant Fargo Ram Jeep etc).
Other interpretations of the name include "More Power" and "Massively Over Powered And Respected".
It is important to note that Mopar (Chrysler) cars nowadays only refers to Chrysler Dodge Jeep Ram family wing (Stellantis North America). It does not refer to the other two wings of Stellantis, which are PSA Groupe Automobiles (Peugeot family) and Fiat SPA. Those two wings are still considered distinct from the Chrysler wing.