When you shit your pants and/or don't wipe well. This leads to your ass being caked in shit due to the lack of wiping.
Jason: What is that horrible smell
Brody: Ummmm..I think I had an accident
Jaosn: What the hell happened
Brody: Well, I don't like the toilet paper here so I have not been wiping properly.Here...take a look.
Jason: OMG...You have an ass caked in shit!!!!
A close relative to the turd. Ass cakes are dropped in the toilet soon after consuming such things as Monster Energy drinks, Dr. Peppers, Dr. McSteves, or Cake. Ass Cakes pass quickly and quietly with little to no pain or discomfort. Dropping an ass cake is usually a pleasant experience that should not even require you to grab the nearest Playboy. It is advised that you announce to anyone that can hear you when you are about to drop an ass cake. It is vital information. They wish to know of your pleasure.
Greg: Hey man, I gotta go drop an ass cake.
Joe: I love you