What is Upper Decker Double Blumpkin?

1.

The act of sitting on the top part of a toilet and shitting while getting head by the girl who is strattling towards you on the bottom seat while also taking a dump at the same time.

The raunchiest act of the famous "blumpkin" to the next extreme calling it the Upper Decker Double Blumpkin.

See blumpkin, toilet, upper decker, upper deck, poop, shit, head
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