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(sfink-ter plinck-o)

The act of having a group of people bent over naked around you in a circle, and then using your erection to penetrate different anus' quickly and briefly at random.
"Oh man, my Friday night was awesome! We had a couple people over, had a few drinks, and played Sphincter Plinko. Talk about putting some stank on it, Yeah Boi!!"
by FuzzyDunnlopp March 19, 2017
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