Clagnutella is smooth soft clagnut much like the spreadable treat. Clagnut is hard, crusty faecal matter in the form of pellet/balls stuck to the pubic hair of the anus. Clagnutella is much easier to remove as it isn't as viscous and superglued to the anal pubic hair as Clagnut.
Guy: Hey girl, would you like anal today?
Girl: Sorry, I've got Clagnutella
Guy: At least its not Clagnut, we can just wash it off!
Those little bits of desicated poo that cling to the hairs around the bum hole after a lack lustrewiping.
Hey Barri, how was your date last night?
Well we had a great meal, the movie was top, we went back to mine and he was just going down on me when he spotted some clag nuts. How I wish I'd used the bidet!