a big pile of poo in a urinal
When someone’s so clueless or lying, they leave a whole pile of poop in the urinal. It’s like they’re saying, 'I don’t care.'
My boss left a giant poop in the urinal. He probably did it on purpose.
That guy didn’t even flush. He just left a pile and walked out.
The urinal was a mess. He was too lazy to clean it up.