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"