A Rude,Obnoxious,Stupid Person (Southern Slang)
Usually after consuming large quantities of alcohol, good ole boys change into Culls, yelling and screaming at the top of their lungs(hog calls, rebel yells, Yee Haw, Yee Haw(The Southern Call of the Idiot) Bad Culls get physical like dancing out of control like stomping around and flailing your arms all over the place like a spastic. or fighting and then falling down and passing out and then throwing up. Then waking up and doing it all over again.
Not remembering what they did the next day.
From the verb to cull(to remove shells from peanuts, to sift through vegetables and throw away the rotten ones
Billy Bob is a bad Cull.