shatter blast

Simply put, explosive diarrhea. The term is usually applied in the instance where the perpetrator doesn't "make it" into the fully seated position prior to detonation. The result being a completely fouled facility - floor, walls, possibly the ceiling, etc.

The haz-mat team was called in to clean up the men's room after someone shatter blasted the stall.

shatter blast by Bizzle my dizzle September 13, 2013

scatter blast 

When you have diarrhea and you hit a pocket of gas and the shit blows out with force, spraying shit all over the toilet bowl

dude I got to shit but someone scatter blasted the toilet, my ass isnt going to sit on that

scatter blast by Dirty Joe Young April 27, 2006