Anal Aneurysm

When one's anus pulsates inwards and outwards excessively quick in a short period of time. This can lead to sever and painful anal prolapse.

Josh: DUDE! I was so fucking constipated yesterday and when I finally had the relief of shitting my brains out my asshole did the weirdest thing.
Dave: Did you have an anal aneurysm?
Josh: Probably...

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