When a female is performing oral sex on a male partner, and she tries to insert one of her fingers into the man's asshole, the man becomes enraged at the female for thinking he would find pleasure in having something inserted into his anus, so he decides to reprimand her by defecating onto the woman's inserted finger. He then forces the woman to remove her shit coated finger from his asshole and eat it, thus creating the Kentucky Corndog.
It is also possible to create a double, triple, or quadruple Kentucky Corndog depending on how many fingers the lady can sneak into your butthole.
Last night this bitch was giving me head, and all of a sudden she starts sticking her finger in my ass. So I squeezed out a nice piece of shit onto her finger and made her eat that Kentucky Corndog!