When two
people connect their assholes with a
plastic tube, preferably clear. They take turns pooping, sending eachothers poop back and forth until either the skyway is full or their bowels are empty.
Think of a bustling
metro skyway, except instead of business
people passing through, it is human excrement.
A: "I have to poop"
B: "I have to poop too"
A: "Wanna skyway?"
B: "Is that even a question"