Well let me throw some lennyspeak here too!!
I'm guessing that you are looking at a private deal here. Not a corn snake from a pet store or breeder. I say that because of the lumpy lower half of the snake
and most breeder wouldn't let it go that bad and a pet store wouldn't feed it that much. So being a private deal, I would think that the owner over feed the snake so this would give you a hint of it overall care/health. Did the owner know they where over feeding it?? You should ask about feeding, how much, how often. Ask the age too. And ask about the set up the snake was in too.
But all this is just a guess. lol
It could be gravid like Dan stated.