A sudden, abrupt bowel evacuation. During the two seconds of literally emptying your entire intestines, you visualize the world's fastest train sucking through a long tunnel. "shhhhhlurp-bam!" 200mph like a sneeze out your ass.
"OMG, that STD medicine worked hella fast, but I almost didn't make it to the toilet before I had an Ass Sneeze!"
by Ominous Front July 28, 2009