A medical condition in which your anus becomes inverted. Often comes from too much anal sex. Other causes may be extreme internal pressure over extended periods of time, prolonged diarrhea, or prolonged constipation.
Shit dude, I just fucked this chick's asshole so hard I gave her an anal prolapse, and I was like "lol, wut?"
The energy created when 2 or more people engage in anal sex. This method of energy production is not known to most of the known world and possess the power to propel a small car or propel a large space craft!
I used the power of anal propulsion to get to school in 3 minutes today!
or
Anal propulsion saved my life...and czechlosovakia