pluff mud
It's is the rotten egg smelling gooey quicksandy mud that is found in the marshes in south carolina
Sally was walking in knee deep pluff mud and her shoe came off and she cut her foot on an oyster.
Pluff mud
The inability to speculate what it was you ate from looking at the newly laid poop in the toilet bowl.
After the boys went barhopping together last night, John knew he had eaten something off the sports bar menu but couldn't tell what that was from his pluff mud he just dropped at the gas station on the way into work the next day.