Analfizzer
An anal fizzer is a type of poop found in the lower region of the bowels, it consists of 'fizz wizz' and cola and causes a fizzing sensation in your bumhole sometimes causing you to shit yourself if you are a loser who does that kind of thing.
"dude i've got to go toilet, iv got an Analfizzer brewing in my bumhole region" and "Jeepers Martin Clunes! I have a serious Analfizzer situation going on here"