FLUSH FLOOD
Similiar to a flash flood but occurs when the person in the stall next to you is on the shatter and has wiped many times but is arrogant enough to attempt a sitting flush an in turn clogs the toilet causing it to overflow and enter your stall rapidly and without warning.
Yo, did you see Alberto's Timberlands covered in toilet paper and water? I heard he was sitting next to Bob when a FLUSH FLOOD occured around 9 AM.