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...
by CaptainShovel February 27, 2015
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When you're catching feelings for someone and you know you shouldn't so your brain does all it can to stop it
"Dude Chelsea gives me such an anal rape Aneurysm"
by Bigolepappy August 12, 2017
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