antonym for explosive diarrhea implosive diarrhea is a spontaneous action in which poop compacts inside of your butthole, and is forcefully ejected out the mouth some 100 yards
Rob: "Holy shit implosive diarrhea! "
Jim: "You know rob, i really don't like you"
Taking a shit with such velocity that it creates a vacuum of space in your body that sucks the fecal matter back inside of you.
He pushed with such force that the diarrhea had became Implosive Diarrhea and flowed back into the comfort of it's dwelling before being released once more.