When you are extremely cheesy and haven't showered for days and have taken adderall for at least 4 days in a row, anything on/in/or around your ass all blends in to be poop Juice.
I studied all for finals the past 5 days straight because I skipped class all semester and now everythingdown there is all poop juicey
The real definition of POOP JUICE is when you piss on a turd that is left in the commode trying to chop it in half and all the shit particles mix with the piss making the liquid a poop-colored juice.