A form of getting high when a person poo's and pee's into a bottle. Then puts a baloon over the top of the bottle. Sets it in the sun and lets the balloon fill with fumes and methane. Once the baloon is full the person inhales the methane fumes and gets high. Symptons of poo hash users is that there breath smells like poo and sewage for the next week.
"I think Jerry tried poo hash his breath reaks"