When you don't want others in a public restroom to hear your explosive
diarrhea. You pucker up and you flush the toilet at the same time while you dump everything you've got. The toilet flush tries to cover your ass blast
noise. Also gets rid of some lingering
diarrhea smells.
Girl 1: Honey, I had to dump so
bad but the bathroom was full and I didn't want to be embarrassed so I had to pull a Flash Flood Dump.
Girl 2: Dang I know what you mean
hun, last time I did that the toilet cut off before I could
stop. It was embarrassing. :/