Wisconsin wind tunnel

When a man lays a woman on the bed on all 4's and uses a dental device that is often used to stretch open someone's mouth for dental operations, to stretch out the female or males anal cavity to a width wide enough to fit a bong. From there the man then packs a bowl of that afghan grass and puts it into the bong and lights it, the man will then proceed to take hits from the bong. Sometimes this can also be called wind swapping or ass gassing. This sometimes can also flavour the smoke with the scent or taste of the receivers anal cavity.

"Hey Dad!"
"Yea Nathan?"
"Wanna try a Wisconsin wind tunnel tonight with my new kush?"
"Sure bud!"

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