Spontaneous Butthole Evacuation Syndrome 

Some people's buttholes just fuckin fall off randomly. This happens a lot in Norway.

I was diagnosed with Spontaneous Butthole Evacuation Syndrome

Spontaneous Butthole Evacuation Syndrome by The Gulath Clan March 7, 2019

Vindaloo evacuation 

When you have a roaring hot diarrhea of fire the day after having consumed very spicy foods, such as a Vindaloo curry. This usually happens first thing in the morning, mere minutes after you wake up, and it stings even worse going out than it did coming in.

Man, last nights curry was friggin' delicious, but it resulted in a painful Vindaloo evacuation early this morning.

Vindaloo evacuation by Kingen March 12, 2010

premature evacuation 

Getting caught while sneaking away after a one night stand.
Alternate: an early post-sex exit, i.e. before your partner is deep asleep.

He hooked up with some girl last night and got busted for a premature evacuation.

premature evacuation by csepulv October 4, 2007

anal evacuation 

when you get indigestion and feces come out your colon in an all of a sudden way like sudden diarhea.

help me im having an anal evacuation.

anal evacuation by supernoc March 26, 2009

evacuation plan

A plan which is useful in every natural or manmade disaster and involves one word: Run!!!

Susan: Honey, can't we listen to the d--n radio, for an evacuation plan from thwe city?

Steve: We have our own--run!!, run mofo run!!!

evacuation plan by Jose Gomez September 6, 2006

Evapulation 

When you cum on your belly and then fall asleep only to find the cum has disappeared when you wake up.

I experienced some severe evapulation when I woke up this morning. Where does it even go?

Evapulation by Reeder3232 June 26, 2020

bowel evacuation 

The process of taking a large poop. It can be solid or loose but the more the better.

Cindy: John, I ate at Pollo Campero 15 minutes ago and then I had sudden bowel evacuation.

John: Maybe it wasn't the food.

Cindy: It's happened the last two times I ate there.

bowel evacuation by Dragon Pipes November 14, 2013