Portmanteau of hillbilly & bully.
A person of questionable genetics (and consequently intellect) often associated with being from Appalachia (qv "Deliverance") who's also heavy into malignant narcissism and menaces/threaten people they don't agree with or like. When called out, they promptly play the victim (qv DARVO), commonly overlaps with "crybully".
By stalking mass shooting survivors, Margorie Taylor Greene has proved herself to be a hillbully.
Another way to say stab or get cut by a knife, broken bottle or a different sharp weapon in a fight. Generally said when someone gets stabbed in the stomach or gut, hence the reference to C-Section.
Tom and Brad got in a fight at the bar last night and brad gave tom a hillbilly c section with a nigga knife after smashing his beer bottle against the bar counter
Watch out or else ill give you a hillbilly c section with this bottle nigga