A person that leaves drops of urine or streaks of defecation on or around a toilet seat. The mystery of this person is that he or she does not claim their "artwork" and instead leaves it for the next potty-goer to notice.
When I went to the office bathroom, I was alarmed to find that the boggling bowl movement maker had struck again and left a poo streak on the toilet seat for me to sit in.
by Chicken Head June 09, 2004
The down marker used during the New Year's Day Boggling Bowl. It is usually carried by a well endowed, surgically enhanced female called the Boggling bowl Queen.
announcer: I thought it was fourth down but according to the boggling bowl movement marker it's only third down. I guess I was a little distracted by the young lady with the enormous assets.
by GORP July 27, 2006