a shit visibly containing bits of corn, blasted out your asshole in an emergency fashion. A truly awful corn blaster will project at a great angle compared to the usual shit, often spackling the side of the toilet bowl. One of the tell tale signs of a truly terrible corn blaster, is an immediately itchy asshole upon crowning.
Pete: "hey Cornelious, are you ready to go to the strong man cometition?"
Cornelious: "I just gotta get rid of this corn blaster, then we'll go."