Shit buoy

A large piece of shit that merrily greets you with a bobbing motion when you peer into the toilet bowl.

Tracey: Will hurry up in the toilet. Ineed to go!
Ben: I'm done.
Tracey: 'Bout time. Grrrrrr.
(...5 seconds later from the bathroom)
Tracey: WTF, I heard you flush, and there's still a monster shit buoy in here. I can see all sorts of crap mushed into it.
Ben: (...sniggers)