Reverse Slip-n-Slide

When one man (or woman) gets on their hands and knees and inserts a funnel into their butthole as another pours milk down the tube into their ass. After this point the milk chugger will have to shit and diarrhea will fly out of the funnel backwards creating a reverse slip-n-slide.

The other night I did a reverse slip-n-slide at my girl's sweet 16...shit was wild