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An extreme form of your usual Shart or even more extreme Mudslide. A Shart Sausage occurs when your butthole is so loose, what you believe to be passing wind turns out to be a fully formed bottom log implanted directly into your underoos.
Example

Dude #1: "As if my life needed to be more embarrassing, I totally just let go a Shart Sausage."

Dude #2: Seriously?! Did you leave your buttplug in again? How is that possible?

Dude #1: A cursed combo of Indian and several ounces of cheese...
by Antimattergizmo April 19, 2017
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