bowl skidder 

An especially large turd that circles the bowl a few times, leaving skid marks before it flushes. Especially common these days due to low-flush toilets.

Raisa was tired of scrubbing the bowl every time her husband Igor took a dump. He left enormous bowl skidders every time, and it took quite a bit of Comet cleanser and a good brush to remove their presense, and what with all the other things Raisa had to do, shave the cat, fry the beetroots and launder all the spacesuits, she was tired of this unnecessary cleaning.

bowl skidder by Luigi July 11, 2004