A slightly overweight, redneck caucasian.
Look at that swarini over there, flying that Rebel Flag on the back of his pickup and drinking Old Milwuakee!
A Dirty Jangus refers to a classic car owner, usually those with undesirable, non-collectible mid-80's GM G-Body cars, e.g. Oldsmobile Cutlass, Chevy Monte Carlo, Pontiac Grand Prix and Buick Regal, that extoll the virtues of their cars to no end when they are in 100% stock form.
That Dirty Jangus has a 100% factory original 1981 Pontiac Grand Prix, what a tool! He should drop an LS1 in it and make it run better.