These people are often called so because of their resemblance to a chicken in a chicken coop picking at the dirt eating whatever they can find—often their own shit.
They can often be found kicking the hell out of their kids at walmart, spening all of their cash on scratch tickets and malt liquor, getting arrested on Cops, and cooking up meth in the back room. An extra rare sighting is one with all of their teeth.
That redneck driving a huge truck with the rebel flag on it is the head dirt chicken.
Dirt chickens often eat their own poop.
Dirt chicken stores often have names like 'Chicken Cottage', 'Texas Fried Chicken' or 'Southern Fried Chicken', and the colours and logo's of the signs may imitate KFC.
Can also be shortened to 'dirt'.
The term originated due to the perceived lower quality of the product compared to KFC (owing to the cheaper price), and because of the 'dirty' appearance of the stores in question. For this reason, 'dirt' may be applied to other take-away foods where the price is low and hygiene questionable, eg, 'dirt curry', 'dirt kebabs'.
"KFC, that's rich man's dirt."