To put it simply, the largest crap you have ever taken. Copious amounts of feces exiting the system at a rapid rate resulting in the need to hold onto something.
Man, I just ate a giant bowl of fiber bran and had to run to the head.....let me tell you, THAT was a bowl holder.
When you take a massive shit. Especially one that fills a large volume of the toilet bowl and leaves the shitter with a strong sense of accomplishment.
To let loose, with extreme force and vigor, an excessive stream of diarrhea. One does not necessarily have to use a toilet for bowl rattling to occur; however, any area chosen as a bathroom suffers extreme damage as a result of the bowl rattler.
Example #1: My bowl rattler ruined my Honda.
Example #2: Bravo Burger is the home of the bowl rattler.
When you blast out such a quantity of shit that you literally fill the toilet bowl. Depending on the size of the particular bowl, you may or may not be sitting in your own pile by the end.
Honey, I knew I shouldn't have eaten those three buffets yesterday. I just had a bowl filler and clogged up the bedroom toilet. Now I need to call a plumber to get all that shit down.